Yep, I know a few people like this. And online is full of them, MN included.
I've seen so many times on here: 'my mum is 70/80/whatever, and has no wrinkles' - yeah, riiiiiight. Or 'people are regularly gobsmacked when I tell them my age, they say I don't look a day over 30 and I'm 50!' - riiiiiiight. Or 'I'm 45 and get carded in shops' - righto.
And inevitably if there's a thread about botox/facelift, those beauties in their 40s/50s/60s with not a single wrinkle and Nivea moisturiser flock there like bees to honey.
When I meet people like this in reality, they inevitably have wrinkles and look exactly their age or often older. If younger, then max 5 years no more, and that's not often. No one looks 30 when they're 50, not even Hollywood A-listers.
Delusions and vanity. When asked to guess someone's age, people usually downplay and guess much lower, not to offend. And obviously they're not going to tell you're wrinkled as a prune to your face, even if you are.
I'm 38. Sometimes people tell me I look younger (unprompted). I really don't. I look exactly as I am. If younger, then by a couple of years maybe, and that's thanks to my chubby cheeks and oily skin. I don't look to be in my 20s, not by a mile. The aforementioned cheeks and oily skin have an advantage wrinkle-wise; I don't have a lot of them, but lines are starting to form around my eyes, faint for now. And forehead. And all my friends who are my age are the same, unless they have botox. No one is smooth as a baby or Nivea Mumsnetter.
And never in my life have I seen a woman in her 50s/60s/70s and wrinkle-free. Ever. Unless botoxed and face-lifted to the absolute max.