anecdotal, I'll admit wrote:
I completed one Marathon at age 33 and ruined by legs and hips. I raced the Marathon on 25 miles per week. Yeah. My fault. I am not a high mileage guy. No way was I going to run over 60 miles per week. Training for 5Ks are good for one's health, not Marathons. I do not think Marathoners are doing them for their good health.
You didn't even come close to training for a marathon. The excuse that you're "not a high mileage guy" is like saying you failed a class because you're "not a studying kind of guy." The irony is you think marathon training is unhealthy, yet your health would have been much better had you actually prepared for it.