That thread made me think: when did this happen to me - the move from childhood into adolescence?
The films and books like it to be a single, life-changing event but it probably happens gradually. I can pinpoint mine to around this time of year in 1982. I had fallen in love with Carmen Turner and it took me about 6 months to pluck up the courage to ask her out. She came round to mine on a Saturday night when I was babysitting and we watched The Omen on VHS and drank shandy.