I'd like to be able to reply along the lines of " About eight but my memory is hazy because I was drunk at the time" but if I'm to be honest the answer is at the tender age of 56. It was a progression from a chap's hobby. I'd 'got into' using only very sharp Japanese kitchen knives at home and the skills I'd learned to keep them sharp lent themselves to an inquistitive dalliance with straight razors. Once I started, I was hooked.
I'd been a wet shaver all my life, since the age of around 15, but the straight made me fall in love with it all over again. Sigh.
allatsea
Alive and well on the Planet of Thanet