Re @Paddingtonthebear's comments, I agree Grace Jones looks good, and as has been said, some black people tend to not age as fast, and can look a bit younger than their white counterparts of the same age. But even then, they still don't look HUGELY younger than their age. Grace does not look 73, but she doesn't look 40 either. I would guess her at early to mid 60s...
Sinitta is another black celeb who looks good, and younger than her age, and is very pretty, but again, not massively younger, maybe 8 years or so. She is 58, but could pass for 49-50.
Also, another celeb who looks good IMO is Davina McCall. Very pretty, and always looks fab! She is 54, and could easily pass for 44-45. Again though, although she looks younger, she doesn't look MANY YEARS younger.
And I have to say, once again, that nobody looks more than 8-10 years younger than their age, not when you look properly. And I agree with a pp that even when someone has sun-tanned too much, and smoked for 30-35 years, they still look roughly their age. They will not look 20+ years older as a pp said.
However, a 45 y.o. woman who has smoked since she was 17 (and maybe used a few sunbeds in her time,) will probably looks 50-52, and a 45 y.o. woman who has never smoked or used a sunbed will look 39. SO by that token, someone who has smoked for 30-35 years or more, (and/or who has used a sunbed a lot in their youth) will look 10-12 years older than someone else of their age.
They will ALL look no more than 8-10 years or so younger - or older - than their real age though. (The vast VAST majority of people anyway!)
No-one looks 80 when they're in their late 50s as someone said earlier, just because they are a smoker. They will just look a bit more tired, with drier skin, and extra lines and wrinkles, and may look 62-64, when they are in their late 50s, but they won't look bloody 80.
Nor will someone who takes great care of themselves end up looking 60 y.o at 80! Although oddly, when people hit 80-85, the ageing process seems to slow down massively, as I have seen 95 year olds who don't look much different to an 82 year old. Again though, they still look very elderly..