Life begins at...

According to a survey (who thinks these things up?), here in the UK we feel we've stopped being young at 35, and start feeling old at 58. There used to be this theory that 40 was a significant point in one's life, but what I remember was that for me it was the odd-decade birthdays that resonated - I definitely saw 30 as the end of my youth, 50 as the pivotal point of middle-age and 70 as the start of old age. My 40th and 60th passed pretty well unnoticed - by me anyway. At 58 I'd recently taken early retirement and was enjoying a new lease of life - certainly didn't feel old. Not that I feel old now - I think age is as much a mental thing as a physical one.