FACTS
Smoking: For those pairs of twins where one twin smoked and one didn’t, the minimum perceived age difference among the twins were 5 years. For every ten years of smoking, the twin who smoked looked approximately 2 ½ years older in appearance. Why is this so? Smoking causes blood vessels to constrict, resulting in decreased blood flow to skin. Further, it depletes the body of Vitamin C, which is key for keeping skin plump and moist. This in turn causes capillaries to become permanently damaged, increased dryness and skin dehydration due to a diuretic effect, a grayish complexion and lastly, an increase in wrinkles, including crows feet.
Alcohol: Alcohol dilates small blood vessels, increasing blood flow near the skin’s surface. This can cause the skin to look wrinkled, red and flushed. What you can do: Try to limit yourself to one alcoholic beverage per day.
source :http://shine.yahoo.com/channel/health/user-post-10-ways-to-not-look-old-and-there-is-living-proof-446838/;_ylt=AucturjweJteD5PfU_IknIhabqU5