Men with a full head of thinning hair

In elderly men, even those not afflicted with AGA, DUPA or ART, does the nature and quality of their hair still decline and get somewhat thin with age? Because most elderly men I’ve known, even if they still have all of their hair on their head, it doesn’t look like the same quality as it was in pictures when they were much younger or when they stand next to a younger person with all of their hair.