I'm 62, 165#, fairly fit, and been running less than a year. When it was warm enough, I was running in the very early morning 2 or three times a week and once on the weekend if I could get away with it. Never exceeded 4 miles. It was great!
Now with the winter I'm stuck on a treadmill and hate it. 3X a week, three miles is all I can stand even with varying the speed and angle.
So really, the answer is "it depends". Everyone is different and you have your own needs. But I hope my .02 helped you.
Pete