A similar chart showing the following life milestones would also be interesting:
- Average age of leaving one's parents' home.
- Average age of marriage.
- Average age of having one's first child.
- Average age of becoming a grandparent for the first time.
- Average age of experiencing the loss of a partner (through death or divorce).
(Not only the age, but also the area between two consecutive milestones, would be very informative)
Have a look at these two additional graphs. They kind of suggest we reach our peak between our 20s and 30s, and I wonder if this has something to do with our brains reaching full maturity in our mid-20s?
PS: I would inverse the charts to have childhood at the bottom; this would to put an emphasis on the foundational role of the early age.