Below are a few reasons:

Sun Tanning Beds – I live down the street from a suntanning boutique and I’m always shocked at how many people are constantly going in and out of that place. Sun Tanning beds bombard the skin with very intense UV rays. These intense UV rays damage the cellular DNA in the skin a little bit at a time and the end result is saggy skin and/or various forms of skin cancer (some of which can be extremely deadly).

A thinning ozone layer – While the ozone layer has stopped it’s drastic degradation (due to pollution) the damage has been done. The result of this thinning means more UV radiation is now being absorbed by our skin (which damages more DNA)

Living longer – It’s a fact that everyone is living longer now. Cells become more eractic as time goes by thus increasing the chance that the cells will divide incorrectly…which is cancer.