I just found this. Some how I had overlooked your post.
My breaststroke practice is coming along. When I began I was doing 45 sec for 25m and 12 strokes. I am now at about 41 sec and the same 12 strokes. As you can see there is progress and some hope. Would love to get it down to 33 sec.
Am going to start another thread re low testosterone levels and sensible expectations re swim speeds. The link you provided shows what 40 and 50 year old can achieve. Want to explore what knowledge is out there re 70/80 year olds.
Thanks for the link.
May we swim with ease at the speeds we choose.