Well, the couple year old pair of jeans I was using for yard work finally blew out a seam from overwork yesterday.
Went into a bureau drawer and pulled out an older pair -- just a smidge tight, enough if buying new I might bump up a size to be safe, by they fit. The pair that finally wore out were 54/30. The ones I'm wearing right now, 50/30.
Edited to add: And I tore a massive rip in them. I'm going to have to check the mower, I'm wondering if there is something sharp by the seat I'm catching the pants on?!