I think I realised it is a genetic condition too - I am in my thirties but vividly recall my (very glamorous, former model) mother telling friends loudly and a bit defensively 'well, I don't smoke, nor spend money on drink, I have no vices and a love of handbags is a pretty small indulgence' back in the 1970s!
Of course, when I was a surly adolescent I thought she was bonkers, now I hear myself repeating the same mantra when I find the latest bag of my dreams . . .And I have a daughter myself - Eek - I am worried about her prospects of avoiding this family affliction that is carried through the maternal line!