9 things you peak at in life by the time you hit 30

Research has found plenty of things to savor about growing old, including an increased ability to build empathy and achieve financial security.

But the scientific research on when people "peak" in various aspects of their life - as determined by the median ages across certain trends - also suggest people max out certain abilities in their youth.

Here's a sample of the abilities and traits people peak at by the time they hit their 30th birthday.