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BBC NEWS | Health | 'Brain decline' begins at age 27
news.bbc.co.uk/1/hi/health/7945569.stm, posted 2009 by peter in health msm science
The first age at which there was any marked decline was at 27 in tests of brain speed, reasoning and visual puzzle-solving ability.
Things like memory stayed intact until the age of 37, on average, while abilities based on accumulated knowledge, such as performance on tests of vocabulary or general information, increased until the age of 60.