I always look up front when I board an airliner, and am always happy when there's a 'gray hair' flying; no substitute for experience in this business (and no, I'm not close to 65...).
My AME told me at my last 1st Class that I am 'way ahead of [my] cohort' i.e., in better shape, and she's very thorough. So age is relative - one guys 35 is another's 50 - that's what medicals are for.