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Of all grandmasters past and present, what is the oldest age at which any of them started playing chess?
Define started playing chess:
This isn't an answer to the exact question posed, but it may nonetheless help.
Lajos Portisch learnt to play aged 12.
Akiba Rubinstein learnt at 14 or 16. (Sources vary.)
Harry Pillsbury learnt at 16.
Arthur Dake (1910-2000) was the oldest competitive chess grandmaster. He was still playing in rated chess tournaments at the age of 89
Vassily Smyslov won the Staunton memorial at Groningen at the age of 75. Jaanis Klovans was 60 when he finally earned his grandmaster title.
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