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Hah, not worth going through everything that's flawed with that.

Suffice to say declines (and gains) begin well before age 24. Also, someone who is 60 but plays regularly will absolutely wipe the floor of a 20 year old who doesn't play. Experience and enthusiasm vastly trump age specifics. Twitch reaction speeds are already declining by 20 (measured in an unrelated study of brain bioelectric rates), yet experience + skill means that twitch shooters are dominated by players well into their 20s who have no jobs.

If anything, that graph shows that people generally 'get a life' after about age 24 unless they can truly go pro (which is a real thing in SC2 in Korea). That doesn't mean not playing games anymore, but probably not playing them 10-16 hours a day every day.