This first tutorial is a very precise and short video on how to remove wrinkles from a persons skin to make them appear younger, without making the photo look ‘shopped’.
In this tutorial it will show you how to dramatically make a person look older with great technique. This is by far my favorite for doing this effect.
I enjoy picking up a Computer Arts magazine whenever I get the chance because of their quality tutorials. Sometimes though, I look past the ones they offer for free. This is another great guide on the aging process in Photoshop.
This is another well written tutorial on adding the years onto one of your photos.