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A teen boy can start to develop facial hair anytime between eight and 12. However, by 15 most men have enough strands to justify their first razor.
When it comes to learning a new language, kids are like sponges. It's commonly accepted that it's easier for most people when they're younger, generally before puberty.
A girl can get her period anytime between eight and 15, but on average it occurs at the age of 13.
A 2010 study found that girls are hitting puberty earlier than the previous generation. However, this is of some concern, as early puberty has previously been linked to an increased risk of breast cancer.
Boys are also developing earlier. A 2012 Harvard study found that boys today are hitting puberty on average at 10 years old. That's three years earlier than 40 years ago.
As boys grow, their voices start to break. An essential part of puberty, it can happen anytime between 12 and 16.
According to data by 'Dataclysm' (2014) author and OkCupid co-founder Christian Rudder, 23 is the age at which women are the most attractive to men. For their part, women don't have a particular age that they prefer in men.
We've all had that moment when we meet someone new and immediately forget their name! Well, according to one study, 22 is the age when you start forgetting names at first introduction.
When we officially become adults, 18 is also the age at which our brain's processing power is at its peak.
Though some statistics indicate that men tend to lose their virginity a little earlier than women, the average age is 17 for both men and women.
An important year in the US for both men and women, 16 is the age they can receive their driving license. The average age in the rest of the world is 18.
Our strength peaks around the age of 25. It plateaus through 35 or 40, and declines at an accelerating rate by the age of 65.
The average age of a first marriage in the US for men is 29. That's a steep increase from 26 in 1990 and 22 in 1960. That's also the age you're likely to have the most friends.
According to a 50-year analysis of marathons, the average age to complete the race in just over two hours was 28.
At 30, both men and women have the densest and strongest bones. After that, bone mass plateaus for women until menopause, when it drastically declines.
In the US, the average age of a first marriage for women is 27. That's a big increase from 23 in 1990 and 20 in 1960.
To know whether physical and intellectual skills worked differently as people got older, researchers studied chess grand masters. They discovered that, on average, competitors do best at 31.
According to a British study from 2013, 32 was also the age women peaked in maturity.
While men reportedly hit their sexual peak at 18, women do so around 35. Presumably because that's when the biological instinct to have a baby hits.
According to a study by the National Bureau of Economic Research, the average Noble Prize winner didn't make their discovery until they were 40. But even if you're not a genius, the study claims that you're still most likely to realize your full creative potential at this age.
In 2015, researchers from Harvard and the Boston Attention and Learning Laboratory found that people in their mid-forties, specifically 43, scored the best in concentration tests.
According to a British study, men don't reach maturity until the age of 43, a full 11 years later than women.
Even if you learned your times tables in elementary school, 50-year-olds are actually the best at answering arithmetic questions.
Scientists gathered about 10,000 people, showed them pictures of subjects' eyes, and asked them to describe what emotion the pictured people were feeling. It turned out that people in their forties and fifties had the ability to correctly identify the emotions.
In their late sixties and early seventies, people have been shown to score higher on multiple-choice vocabulary tests. This means you'll have an impressive vocabulary by then.
A study published in the Proceedings of the National Academy of Science revealed that Americans reach their peak emotional well-being at 82.
Sources: (Best Life) (Insider)
See also: Things that get better with age
Studies have found that American men and women have higher levels of life satisfaction in their early twenties and then again at 69.
According to a study by Gallup, both men and women feel best about their bodies and physical appearance after the age of 70.
A lab test showed that 32 was the age people could quickly and most accurately recognize the faces of strangers upon seeing them a second time.
One of the coolest things with humans is that, as different as we may be, there are certain rites of passage that happen for most of us. And even if aging can seem scary, scientific studies have found that life isn't a downhill slide after our youth passes. There are plenty of areas that we peak in well into middle and old age. For example, teens may have vitality on their side, but older people are generally more psychologically stable.
Intrigued? Then check out the following gallery to discover some of the most important years of your life.
These are the most important years of your life
These are the ages we tend to hit crucial milestones
LIFESTYLE Age
One of the coolest things with humans is that, as different as we may be, there are certain rites of passage that happen for most of us. And even if aging can seem scary, scientific studies have found that life isn't a downhill slide after our youth passes. There are plenty of areas that we peak in well into middle and old age. For example, teens may have vitality on their side, but older people are generally more psychologically stable.
Intrigued? Then check out the following gallery to discover some of the most important years of your life.