Oh damn. You lot make me feel ancient. I'm 54 (only just, only just) and I think I've had this problem for about 4 years. So much as I'd love to blame it all on a 10lb 41/2 oz baby 21 years ago I don't think so as I didn't even get hemmies!
I think stress hasn't helped and, over the years, there has been lots of that. I can pinpoint various BMs that have really started episodes. Not always sure what causes the 'tough' ones. Being in my 50s?
I can't put my finger on whether my age makes above average, out of the ordinary or just plain weird.