Mental powers start to dwindle at 27 after peaking at 22, marking the start of old age, US research suggests.
" The natural decline of some of our mental abilities as we age starts much earlier than some of us might expect "
"In nine out of 12 tests the average age at which the top performance was achieved was 22. The first age at which there was any marked decline was at 27 in tests of brain speed, reasoning and visual puzzle-solving ability."
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