Could be historic, scientific, personal etc. Anything which makes you reflect about the unlikeliness of you being able to do it yourself fits the bill.
For example, even my grandmother, during German occupation of Poland, was able to take care of her younger siblings and bedridden mother, while being 14-16 years old. And, by "taking care of" I mean plowing the (small) fields they had, feeding the cow, making sure the siblings aren't starving, fending off Germans and their random executions of Polish commonpeople etc. By today's standards it's absolutely extraordinary, but it wasn't really uncommon back then.
Some were older, like Thomas Jefferson who was 33, John Hancock who was 39, or Benjamin Franklin who was 70. Others were shockingly young — even teenagers. James Monroe, for example, was 18 and Alexander Hamilton was 21. Madison was 25.