Why are the stars (of any kind and age) pretty?

Start with natural attractiveness.
Add make-up and expert hair styling.
Retouch the photos.
Budget thousands for plastic surgery.
Schedule exactly the right kind of exercise and watch the diet like a hawk.
Keep trainers (people, not shoes) around the house.

Result - good looks. If they can keep off the booze and drugs.
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I saw a picture of Emmylou Harris today. She's 62. Looks 32, at least in the face. Picture of Dorian Gray, anyone?

Years ago I saw Paul Newman on TV at the age of 70. He was very handsome, but his face was as rigid as a sheet of plastic from all the facelifts. Me, I'll just keep my smile lines.