I have very little hair so have shaved it for the last 20 odd years. I also get a lot of grey. Baldness doesn't run in my family.
My wife is 38 and has had loads of grey hairs for years. She goes through stages of thinning out and bald spots but the hair always seems to return. She doesn't drink but is a very stressful woman.
It doesn't make sense to me that alcohol would be a direct link. Some people just seem to be blessed with good hair and others not so much.
Alcohol is to blame for many things in my life but I don't think I can blame my lack of hair on it. Though drinking certainly won't make it grow back.