At some point in everyone's life, one is young. At this "young" age, the skin is smoother, hair is at its flowiest, and the body is in tip-top shape. Here are some older actors who you'd literally want to travel back in time just to bang.
1. Jeff Bridges:

This is a perfect example of "youngness." Look at Jeff Bridges' superbly tan body, made even tanner by his white linen pants. And his hair, so light and airy and blonde. Very nice.
2. Clint Eastwood:

What's better than a nice toned fellow fixing a car? Clint Eastwood as a nice young fellow fixing a car.
3. Robert Redford:

That stubble, that fresh-faced beauty. What a darling sight.
4. Harrison Ford:

AOOGA, AOOGA! Let's take a time machine back to the moment after this photo was taken so we can tell Harrison Ford how much he NAILED BEING YOUNG.
5. Gary Oldman:

He looks great now, but when he was less old, he was also great.
6. Christolph Waltz:

Hot damn! That hair! That gaze! What beauty!
7. Ian McKellen:

Ian has aged gracefully, but there was once a time when he wore tiny blue T-shirts and tight black pants. It was nice.
8. Chevy Chase:

Before he went gray, Chevy was a bona fide hottie.
9. Martin Scorsese:

Martin Scorsese used to be cute in a hipster, cool kind of way.
10. Bill Cosby:

YES THIS IS THE SAME BILL WHO WEARS THOSE COLORFUL KNIT SWEATERS. What a fine skinny-tie-wearing man.
11. Tommy Lee Jones:

Tommy Lee Jones went to Harvard, where he was a football player and probably starred in every football game/everyone's hearts.
12. Alec Baldwin:

BAZINGOW! How primey was Alec Baldwin's prime?
13. Robert De Niro:

!!!! BOBBY BOY!!!
14. Jack Nicholson

This outfit is questionable, but other than that I want to bring him home to mom and date and age with him and I don't care how strange he becomes.
15. James Garner:

I'd have read his notebook! (Ha ha, get it, The Notebook, he was the old guy. Lol.)
16. Christopher Plummer

What a handsome man under the age of 50, I tell ya.
17. Al Pacino:

OK, but he was actually adorable when the hair was au naturel and wavy like the sea.
18. Peter O'Toole

MORE LIKE PETER O' WHATAHOTTIEHEWAS!
19. Steve Martin:

Holy cowbells and peanut butter sauce. This is Steve Martin when he had fewer years on him and boy did I just melt into a puddle.
20. Michael Douglas:

Look at this hair!! Look at those eyes! How youthful and wonderful.
21. ...and dad Kirk Douglas

OK KIRK. WOW. WOW. Just WOW.