Like Sleazy said, growing slower is the best way to prevent them. But being that that's not all that easy to monitor (you don't know if you're growing too fast until the stretch marks show up) there are other ways to help...

Keep very well hydrated. Skin cells need water.

Take Vitamin E. One tab a day should be good. Also, take Vitamin C. Antioxidants are your friend.

Lotions are good as a prevention too. Try to avoid the ones that have a lot of alcohol in them. Most lotions do, surprisingly. Check the ingredients, and if alcohol is one of the top listed, don't use it.