Crossword Genius

Chose limit that's variable in old age (10)

Ross

I believe the answer is:

mesolithic

'in old age' is the definition.
(Mesolithic period)

'chose limit that's variable' is the wordplay.
'that's variable' indicates anagramming the letters (a varied form of the letters).
'chose'+'limit'='choselimit'
'choselimit' with letters rearranged gives 'MESOLITHIC'.

(Another definition for mesolithic that I've seen is " early history".)

I've seen this clue in The Independent.
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