When will I be officially 'past it'?

At what stage will women just give up on me and not bother to even look at me any more? How much time is left? I was almost hit by a speeding bike this morning, so all day long I couldn't stop thinking about how I was just one second away from death. But he who lives by the sword, dies by the sword. Yet I walk a lonely path, which nobody else, not even a woman, treads on ... am I invincible? Am I going to live forever?