How old am I?

I once built an astable multivibrator (using, as I recall, a pair of BC108s). My brother's comment when I showed him the bulb flashing on and off was, 'how old are you?'

So, I have now for the first time in my life redirected the error to null:

$ find . 2>/dev/null -name "redacted.pl" -print

Blimey. How old am I? :-)