Also, by coincidence I happen to be checking out the site and if you’re not familiar with worth1000.com They have contests in numerous categories also forums, so it would be an excellent place to check out. The main reason for this quip though is because recently they had a contest on doing this exact effect you’re talking about.
Here’s a quick copy and paste* of the rules.
As children (and especially teenagers trying to get into bars) we all wish we looked older. As adults we wish were children. Looks like image-editing is the closest to a fountain of youth we will ever come. In this contest you will take anyone or anything famous, dip them in the magical waters of Aviary, Photoshop, Pixelmator or any other program and pull out a different aged version of themselves as in our themepost.
The rules of this game are thus: You may use any famous person, but must age them (either younger or older so that a difference can be seen easily). You should include the name of the person in your title.
Please, DO NOT post WIPs in your comments. Post them in the forums after the contest has ended.
Have fun, be creative!, keep it clean, follow the Arena Rules please, and be careful to avoid using cliches. You will have 48 hours to submit so make your entry count! As always, quality is a must. We’ll remove poor images no matter how much we like you.
* via worth1000
Here’s the entrys
Also if you click the link under an entry you get to see what they used to create the photo if they have posted the sources.
Enjoy and have fun. :)