5. Gabrielle Union
Gabrielle Union is one of those celebrities who has barely shown any signs of aging. Check her out at the age of 25, which she turned in 1997 — she looks just as amazing now as she did then. 

Gabrielle's breakout role in Bring It On didn't go down until 2000, but around the age of 25, her career began heating up. She had small roles in Star Trek: Deep Space Nine, Sister, Sister, Smart Guy, Friends, and was in five episodes of 7th Heaven. Next came She's All That and 10 Things I Hate About You, and the rest is pretty much history.