Ugh... It's all downhill from here (and an underpriced resource for employers)

From Psychology Today:

Other long-standing data show that teens are at least as competent as adults. IQ is a quotient that indicates where you stand relative to other people your age; that stays stable. But raw scores of intelligence peak around age 14-15 and shrink thereafter. Scores on virtually all tests of memory peak between ages 13 and 15. Perceptual abilities all peak at that age. Brain size peaks at 14. Incidental memory—what you remember by accident, and not due to mnemonics—is remarkably good in early to mid teens and practically nonexistent by the '50s and '60s.

Apparently if you're over the age of 15, all you have to look forward to is death. Of course, your mental acuity may have depreciated to the point that you're too er, stupid to realize it. Which reminds me, I'd better write it down: buy key man insurance (of course, not that there's really such a thing as being a "key man" if you're a founder either - ugh, that makes two pieces of excellent news this week to shred my self worth). On the other hand, this means that we should be hiring a lot more child labour.