I'm in my 50s, and have very few lines/wrinkles. Just genetically fortunate. I also have no jowls (yet.) My neck is OK too. I STILL look like a woman in my 50s... Why the fuck WOULDN'T I look like a woman in my 50s??? Moreover, what is WRONG with looking your age?
Why are people so desperate to insist they don't look their age, and even though they're 42, they are constantly asked for ID, they get asked why they're not in school, and when they answer the door to someone, they get asked where their mommy is?! I don't know a single person in real life who this has ever happened to.
My daughter gets asked for ID occasionally, but that's because she's in her mid 20s, and people aren't sure of her age. She looks 18-19 sometimes, and mid 20s other times. Depending on how she is dressed, and if she has make up on. She sometimes looks 18-19 y.o. She does not look fucking 12!
In addition, a woman I know who is 43 has 2 daughters aged 16 and 18, and from 50 yards or so away, they all look the same. 5 ft 5-ish, long medium brown hair, and similar clothes. On closer inspection, you can tell which is the 43 year old mother! She is very pretty, and does look younger that 43 to be fair. But she would pass for 33-35 at the youngest.
NO-ONE looks more than 8-10 years younger, not when you look properly. Even celebrities like J-Lo and Jennifer Aniston (both in their early to mid 50s,) who are both pretty, and look good, do NOT look much younger than their age. They still look like... women in their mid 40s. They don't look 18!
People are deluded. As a few posters have said, when someone is guessing someone's age, they knock 5 to 10 years off to be polite. I know a woman who asked me to guess her age once, and I was polite. She looked 48-50, and I said 'umm 40 to 42?' She was 41, and was incensed that I said she looked 40-42. Because SHE thought she looked early to mid 30s. 'You're joking' she said 'You think I look 40?!' 
I said, but you are 41 anyway? So I have got it almost bang on...'
She said, 'yeah but everyone thinks I look like I am in my early 30s. How rude to say I look 40.' 
Some people on these threads pull out Floella Benjamin. She is very attractive and DOES look younger than 73, but she does not look 35! She looks like a woman in her early 60s. Ditto Helen Mirren. Attractive, and looks younger than 77, but again, maybe mid to late 60s... She doesn't look any younger than mid to late 60s. They both look 10 years younger at the most. (Except when Helen had that dreadful long hair the other week... That made her look 80!)
AGAIN, ........ WHAT IS WRONG WITH LOOKING YOUR AGE???????? 