[Itse]

Originally Posted by mikey_the_redneck

Hilary Duff, Miley Cyrus, Ana Kornikova etc. were/are all SMOKIN' hot before they were 20.......

(the first one I found, results of a very large poll, ages at the time of the poll):
FHM hottest women of 2006

1. Keira Knightley, 22
2. Keeley Hazel, 20
3. Scarlett Johansson, 22
4. Angelina Jolie, 31
5. Kelly Brook, 27
6. Cheryl Tweedy, 23
7. Beyonce Knowles, 25
8. Evangeline Lilly, 27
9. Jessica Alba, 25
10. Jessica Simpson, 26
11. Billie Piper, 24
12. Sienna Miller, 25
13. Lindsay Lohan, 20
14. Rachel Stevens, 28
15. Sarah Harding, 25
16. Jennifer Love Hewitt, 27
17. Halle Berry, 40
18. Jennifer Aniston, 37
19. Fearne Cotton, 25
20. Eva Longoria, 31

So yeah, there are sexy girls under 20, but in general the hottest women are older than that.