I'm 61 now. I ran consistently from age 28 to 35. Took some time off to raise kids, and then started running again in my mid-40s, and started running 50 miler ultras at 50. Backed off to avoid injuries but still running fairly consistently with many months off here and there due to injuries. While I was never fast I did notice that I did progressively go slower over the years. It's inevitable. Now I just run 15-25 miles per week at a very slow pace, using the Maffetone method just to keep my aerobic base going. I recommend this approach. You just go very slow but go long, >1 to 2 hours to keep building you base w/o injury. Since adopting Maffetone I have been injury free for several years and I feel great and I love my runs. I also love that strenous hikes count as maffetone training. There is no need to run fast. Just stay in your aerobic zone. Google it up.
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