Agreed.
The single largest change I've noticed is my feet have grown both in width and length during my 50s; at age 50 I was a pretty consistent 8-8.5 D for my running shoes, now at 59 I'm up to 9.5 EE or even EEEE.
My blisters started during the 2014 Reach the Beach relay when, due to a last minute loss of a team member I had to run both Leg 1 (8.1 miles) and Leg 6 (8.6 miles) during the first rotation; the blisters started between my third and fourth toes on both feet (my toe shape has changed such that the middle toe sort of overlaps part of the pad of the fourth toe). I bought a pair of toe socks later that day and used them for the rest of the relay.
A few weeks later (with no recurrence of blisters) I ran my first half marathon in a relatively new pair of shoes (only about 50 miles on them). Unfortunately it was already in the seventies and humid at the start and well into the eighties at the finish; at the 10-mile mark I noticed my feet were literally swimming in my shoes (which were 9.5 EEEE, and probably a bit too wide, and I was dumb enough to leave my toe socks at home) from all of the sweat cascading down my legs and into my shoes. By the time I crossed the finish line, only two minutes slower than my goal time, the blisters I got during the RTB relay had come back with a vengeance, along with new ones at the base of the big toes and the front of each ball.
Since I started wearing toe socks I have yet to have another blister. 🙂
