You and I seem to be on very similiar paths. I am 47 and have run 28 marathons. Used to run 70 miles per week, then nagging injuries became a viable foe, so I've pared mileage down to 45. Interestingly, marathon performance did not suffer from the drop in quantity.
But even with the mileage reduction, some injuries continued until I finally got smart. I've found training to be markedly better by avoiding concrete sidewalks and paved roads whenever possible. Dirt or wood chip trails, parks, athletic fields, fairways, and rubberized ovals have restored the energy in my legs, eliminated most of the troublesome injuries (including lower back pain), and taken the work out of the term "workout".
Now admittedly, most marathons are run on paved roads. But getting to the starting line healthy becomes everyone's principal objective after age 40. New Zealanders are very smart abut this. Masters great John Campbell did most of his distance work on wooded trails and intervals on park lawns.
Good running to you, friend.
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