Age Calculator

Humans have a long history of utilizing numbers as they navigate the world around them. Still, moving from simple to more complex problems requires tools like a calculator to aid in problem-solving. We've come a long way on the road to modern calculators.

The age calculator is designed to solve various problems that can be difficult to navigate on a typical calculator. Calculating the addition or subtraction of time is often incompatible with standard calculators due to the unit of time. Here are some of the problems you can solve with an online age calculator:

• calculating the duration between two points;
• determine how many days until an upcoming event or birthday;
• figure out how old someone is, based on their date of birth;
• identify the age of a city, building, or monument;
• learn how long ago an event occurred;
• convert between different time units, including seconds, minutes, and hours.

The best part about utilizing an age calculator to navigate gaps in time is the rapidity of results and accuracy.

The age calculator can be the perfect tool for calculating many types of time differences. But one specific example of utilizing an online calculator is giving someone a personalized anniversary gift. You can dive deeper than just counting the years.

1. Learn the initial date of the event.
2. Launch the website of your favorite online age calculator.
3. Input the initial date of the event where it says, "Date of Birth," including the year.
4. Input the date you plan to give the gift where it says, "Age at the Date of."
5. Select "Calculate" to receive the anniversary duration in days, hours, minutes, and seconds.
6. Print this date as a decorative print and frame it for a thoughtful anniversary gift.

How to Use an Age Calculator

When getting to know a new calculator, it is beneficial to take the time to learn the rules and functions.

1. Gather all of the data needed for your calculation

When using a current age calculator to calculate an exact age, gathering all the data you need before getting started, including your start and end time, is essential. Additionally, it is beneficial to be as specific as possible about the times you use for more accurate results. For example, suppose you are calculating your exact age. In that case, you will get a more precise result by including the minute and hour you were born rather than the day, month, and year alone.

2. When performing calculations, double-check that you are using the correct month and year.

When calculating the time difference, it can be tempting to take the shortest route. Perhaps for simplicity, someone will assume that the length of the period between the two dates will be the same regardless of the month. For example, consider that the period between January 4 and February 4 will be the same length as the period between February 4 and March 4. Remember that a month can be between 28 and 31 days, so selecting the correct month can significantly impact the accuracy of your calculation.

Additionally, every leap year has an extra day of the year – February 29. When calculating an age, it is crucial to ensure the correct year is selected, so the time is measured accurately. If you forget to alter the year and only choose the month and day, your calculation may be incorrect by at least a day.

Age Was Once Mysterious and Vague

Hundreds of years ago, specific birth information was seldom recorded—especially for those in the lower classes. When technology was primitive, tracking someone's age was relative and unspecific unless their local church recorded their birth. People tracked someone's age using different methods if the birth was not recorded.

In medieval times, someone's age may have been counted in relation to the passing of seasons or based on which king was reigning. Furthermore, during the medieval era, people estimated age based on biological development, such as when a boy learns to walk, or a girl reaches puberty and can give birth. Although these methods of age tracking were sufficient for the time period, once birth tracking became more specific and regulated, age calculations became more accurate.

Human age

We have more than one age because "age" has several meanings.

Calendar age

We have a chronological age, a biological age, a social age, a psychological age, a subjective psychological age, and even an immune age. Let's find out in more detail how they differ and whether it is possible to calculate these ages.

The passport age is determined by the number of years (months and days) that have passed since a person was born. In the modern world, when a person is born, they are conditionally 0 years old. And after one year of life, you can add another year.

Korean age

Some Asian countries, such as China, in ancient times had a different system. When a child was born, he was considered one year old. And a new year of life was added on the day of the lunar New Year. In South Korea's traditional system, a year was added to a person on the day of the New Year according to the Gregorian calendar. Thus, a child born on December 31 could become two years old the next day in the traditional age-assessment system. This designation system is sometimes called the "Korean age."

The international system is used for official government purposes, documents, and legal procedures. People can now use the traditional age system in China to calculate a person's horoscope.

The traditional Japanese system of counting age, which increased a person's age on New Year's Day, was legally abolished in 1902. But today, the traditional system can be used in Japan by the elderly and in rural areas. It is also used in traditional ceremonies and divination.

Biological age

Biological age measures the physiological wear and tear of the body. Biological aging is unique to each person. Someone may lead an unhealthy lifestyle and wear out their body very quickly. Some people may take care of their health, do sports, live in favorable environmental conditions, not subject themselves to stress, and have good genetics. And most likely, such a person may have lower body wear and tear rate.

Biological age can give information about the risks of various diseases and premature death more accurately than chronological age.

There is no generally accepted scientific way to determine an accurate biological age. But scientists can apply some parameters to determine biological age. These parameters are appearance, stamina, weight, exhalation volume per second, hearing and vision acuity, cardiovascular health, blood pressure levels, and cholesterol or C-reactive protein levels.

Genetics can also guide us in determining biological age. Studies on epigenetics examine the changes that accumulate in the DNA of cells over time. Scientists use a sample of saliva or blood to detect markers of aging in DNA. The more aging markers a person has, the more worn out their bodies are.

Cognitive abilities play an important role in determining a person's biological age: memory, concentration, ability to analyze information and learn new things.

Self Determination of Biological Age

Without the help of specialists and specific tests, it is difficult to determine the biological age accurately. But there are some ways to give an approximate estimate—for example, methods based on physiology. One of the most famous formulas is the Voytenko formula. According to it, the biological age (BA) of a person can be determined as follows:

For Men:

$$BA = 27 + 0.22 × BPS - 0.15 × BHD + 0.72 × SHE - 0.15 × SB$$

For Women:

$$BA = 1.46 + 0.42 × BPP + 0.25 × W + 0.7 × SHE - 0.14 × SB$$

• BPS - systolic blood pressure, "upper," measured in mm Hg.

• BHD - duration of breath-holding after deep breaths, measured in seconds.

• SB - static balance in seconds. To find this parameter, stand on your left leg, close your eyes, lower your arms along your torso and record how long you can stay in this position.

• BPP - pulse blood pressure is the difference between the "upper" and "lower" blood pressure readings.

• W - body weight in kg.

• SHE - subjective health evaluation. It is determined by a special questionnaire that includes 29 questions. In the ideal case, the SHE is 0. In the worst case, it is 29.

Can Your Biological Age Be Reduced?

The changes accumulated in cells are pretty challenging to reverse. But you can try to slow down aging. The standard rules of a healthy lifestyle can help you do it.

• Eat healthily. You should eat plenty of fruits, vegetables, meat, and dairy products. Eat less processed food and fast food.
• Be socially active. Spend time having pleasant conversations with friends and acquaintances and attending events.
• Be physically active. Combine regular exercise with comfortable walks in your schedule.
• Get enough sleep regularly. Devote 7-9 hours a night to sleep, depending on your individual needs.
• Learn to manage your stress.

Psychological age

Psychological age is the number of years attributed to a person according to their way of thinking and behaving. The younger a person feels, the healthier they are, the better their memory and learning ability, and the longer their life. However, scientists do not know exactly where the causes and effects lie. Perhaps a person subjectively feels younger just because he has long maintained good health and strong memory.

Knowing how young you are psychologically can help you understand some things about how you feel. If you find you are mentally "old," that's a good reason to add more physical activity to your daily routine. In that case, you should start communicating more actively, get interested in new inventions, and stop associating yourself with old age. And your psychological age can correct itself.

How to determine your psychological age

The easiest way to find out your psychological age is to ask yourself: "How old would you be if you didn't know how old you were?"

There are many tests for this purpose. Some of them rely on self-perception, and the behavior one expects of oneself. Other tests take into account a person's background:

How informed are they about different events in the world? What are they interested in? What level of education do they have?

Some tests for determining psychological age are based on the brightness of one's worldview. For example, some online tests can detect your psychological age based on how you perceive shades of color.

One of the most interesting tests for determining psychological age was developed by Fan Longevity. The company has created an artificial intelligence application to track the aging process and help people extend their healthy and productive lives.

Experts trained the neural network by feeding it over 10,000 questionnaires from 25–75-year-old people worldwide. The artificial intelligence analyzed their answers to the same questions. It correlated them with the participants' passports and subjective psychological age.

The test consists of 18 simple questions. To determine the psychological age, you need to answer questions such as:

• Looking ten years ahead, what do you expect your contribution to the well-being and well-being of others to be at that time?
• How much does your health limit you to running or lifting heavy objects?
• In the past 12 months, has there ever been an occasion when you felt sad, sad, or depressed for two or more weeks in a row?

During the test, you should also express your degree of agreement with some of the statements. Some of them include:

• Life is a continual learning process, changing and growing for me.
• I have not had many warm and trusting relationships with other people.
• I get excited or anxious quickly.

Social age

The social age is related to changes that occur in the psyche and are age-dependent. These include the most important life events in a person's life:

• The time of marriage.
• The beginning and completion of education.
• Age-related changes determine a person's outlook and attitude toward life.

The main criterion in determining social age is a person's achievements or lack thereof compared to their peers.

Let's say there is an age when people mostly have families, have children, become students, or finish their careers. These are generally accepted norms. Researchers rely on them to establish a social age. Suppose a person does not fit within the average. In that case, it indicates that their social age is lagging or advancing, depending on which direction the discrepancy goes.

For example, a young person graduates earlier than his peers. His peers are still studying, while he is already working and moving forward in his career. In this case, his social age is higher. Here we are talking about early social maturity.

The social age is determined by upbringing, intelligence, social environment, and personality traits.

Mental age

Mental age looks at the intellectual performance of a particular person at a specific age. The method of determining mental age compares a person's performance to the average intellectual performance of others of their chronological age.

Mental age was first defined by French psychologist Alfred Binet, who introduced the intelligence test in 1905. The psychologist figured out how to calculate mental age by administering a standard intelligence test. Then, after getting the result of the IQ test, the psychologist puts it into a short formula.

$$Mental\ age = (IQ / 100) \times Chronological\ age$$

For example, the subject is 20 years old. He took the IQ test and got a score of 120. The psychologist will first take the IQ score and divide it by 100 to get a score of 1.2. Then the psychologist will multiply the result by the chronological age of the person, which is 20 years old, and get the mental age, which is 24 years old.