I kind of feel stuck in the middle. I'm in my mid-thirties, so past the acceptable partying of my 20s (which I did without drinking alcoholically), yet a bit on the young side for the baby boomers and older Gen X-ers.
For me, it has been about 3 years of heavy binge drinking, but the sad thing is it coincided with me starting a family (had severe postpartum depression on top of my decade-old clinical/chronic depression and coped the wrong way), and that is a whole other level of guilt to deal with.