The thing is, there's nothing you can do about it is there, so you might as well just forget about it. Having said that I had a wobble about being 35 last year, I definitely went though the "what am I doing with my life" thing – was being made redundant at the same time which really didn't help.
But every time I worry about my age, I look at my dad, who at nearly 76 is having the time of his life. He's married to a woman 10 years his junior and goes on about 6 or 7 holidays a year – all over the place – Mongolia, Ethiopia, Uzbekistan, Russia, Sri Lanka, to name but a few recent ones. He retired at 60, got married about 4 years after that, so I reckon life actually begins at 60. I'm looking forward to it…