1954 film starring Frank Sinatra and Doris Day (5,2,5)

I believe the answer is:

young at heart

(Other definitions for young at heart that I've seen before include "Essentially youthful" , "Elderly, but not feeling it" , "Aged but lively" , "Old, though not thinking as an oldster" , "Sinatra ballad - with 4d" .)

I've seen this clue in The Independent.

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