t1%3B%2Cat%20his%20prime%3B%2Cc0
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Mister MicawberThis is a good resource: https://books.google.com/ngrams/graph?content=in+his+prime%2C+at+his+prime&year_start=1800&year_e...Thanks a lot teacher. I will definitely use that in future.
fivejedjonIt says mothing specifically about correctness, but it strongly suggests that the most natural prposition for native speakers is 'in'.Thanks a lot teacher.
Anonymouss, although 'in' is the most natural, is 'at' correct?Yes.
Mister Micawber Anonymouss, although 'in' is the most natural, is 'at' correct?Yes.Thanks teacher!