Alcohol is a diuretic and will dehydrate your whole body including your skin. Adequate moisture is extremely critical for a healthy youthful looking skin. Dry skin is much more likely to form wrinkles over time. Regular consumption of alcohol will age you very fast.
Alcohol is also a hepatotoxin (toxic to liver) – which means over the long term alcohol also causes damage to your liver, which will compound your shriveled up looks.