At least one study suggests that unlike athletic abilities that do peak at around 20, fluid intelligence is more complex and may peak all the way up to 50 years

At least one study suggests that unlike athletic abilities that do peak at around 20, fluid intelligence is more complex and may peak all the way up to 50 years. http://m.pss.sagepub.com/content/26/4/433 http://m.pss.sagepub.com/content/26/4/433