This! 60 is the new 40, in so many ways. I look at my parents' wedding portraits where they posed with their parents and my grandmothers, who were in their mid to late 50s, look like old ladies. That would not be the norm today (or at least I hope not, since I'm just a few years younger than they were in those photos)! Most - that I knew, anyway - grandmothers in the early '80s dressed in a matronly fashion that today would be frumpy, didn't work out, didn't wear full makeup (a lady wears a little powder and lipstick, maybe a discrete touch of rouge), didnt colour her hair, wore "sensible" shoes etc etc. Factor in the hardships of living through a world war or two, the Great Depression, and years of doing the housework by hand (remember ringer washers, anyone? And what those did to your moms' and grandmothers' hands?)....
I could totally buy that she was in her 60s at least.