Excessive drinking, smoking, and tanning

take up smoking.

works every time.

Yell and be angry all the time.

Go into a coma for several years. When I wake up it'll feel like no time has passed and I'l suddenly be in my mid-forties.

Smoke, drink and lay out in the sun to get a very dark tan and forego veggies & fruits in favor of deep-fried foods, sweets and all manner of junk foods. Have a negative attitude too.

One word? Stress

Booze, cocaine and cigarettes.

By worrying constantly and not taking good care of your body...