1.
Zac Efron at 18.
Mark Mainz / Getty Images
Zac Efron now at 31.
Neilson Barnard / Getty Images
2.
Joe Jonas at 18.
Stephen Lovekin / Getty Images
Joe Jonas now at 29.
Pascal Le Segretain / Getty Images
3.
Vanessa Hudgens at 18.
Frazer Harrison / Getty Images
Vanessa Hudgens now at 30.
Jason Kempin / Getty Images
4.
Miley Cyrus at 18.
Christopher Polk
Miley Cyrus now at 26.
Mark Ralston / AFP / Getty Images
5.
Selena Gomez at 18.
Jason Merritt / Getty Images
Selena Gomez now at 26.
Frederick M. Brown / Getty Images
6.
Hilary Duff at 18.
Evan Agostini / Getty Images
Hilary Duff now at 31.
Emma Mcintyre / Getty Images
7.
Raven-Symoné at 18.
Amanda Edwards / Getty Images
Raven-Symoné now at 33.
Valerie Macon / AFP / Getty Images
8.
Dylan and Cole Sprouse at 18.
Tim P. Whitby / Getty Images
Dylan and Cole Sprouse now at 26.
Kevin Winter / Getty Images
9.
Brenda Song at 18.
Mark Mainz / Getty Images
Brenda Song now at 31.
Handout / Getty Images
10.
Shia LaBeouf at 18.
Kevin Winter / Getty Images
Shia LaBeouf now at 32.
Dia Dipasupil / Getty Images
11.
Ashley Tisdale at 18.
Carlo Allegri / Getty Images
Ashley Tisdale now at 33.
Phillip Faraone / Getty Images
12.
David Henrie at 18.
Noel Vasquez / Getty Images
David Henrie now at 29.
Rich Polk / Getty Images
13.
Corbin Bleu at 18.
Noel Vasquez / Getty Images
Corbin Bleu now at 30.
Michael Loccisano / Getty Images
14.
Aly Michalka at 18.
Scott Gries / Getty Images
Aly Michalka now at 30.
Jean-baptiste Lacroix / AFP / Getty Images
15.
Danielle Panabaker at 18.
Mark Mainz / Getty Images
Danielle Panabaker now at 31.
Presley Ann / Getty Images
16.
Jake T. Austin at 18.
Michael Buckner / Getty Images
Jake T. Austin now at 24.
Rich Polk / Getty Images
17.
Moisés Arias at 18.
Alberto E. Rodriguez
Moisés Arias now at 24.
Kevin Winter / Getty Images
18.
Jason Dolley at 18.
John M. Heller / Getty Images
Jason Dolley now at 27.
Alberto E. Rodriguez / Getty Images
19.
Nick Jonas at 18.
Michael Buckner / Getty Images
Nick Jonas now at 26.
Rachel Luna / Getty Images
CORRECTION
In a previous version of this post Hilary Duff’s current age was incorrect.