"Researchers have found that peoples' mental abilities peak at 22 before beginning to deteriorate just five years later." The 5-year gap doesn't make sense. I

"Researchers have found that peoples' mental abilities peak at 22 before beginning to deteriorate just five years later." The 5-year gap doesn't make sense. If you're at your peak at age 22, wouldn't you, by definition, begin to decline immediately after? :-) I suppose you could level off for 5 years, but then it's misleading to call 22 a "peak".