Man, you didn't leave....you just took a break. We all have. Most of us here have one major ding or another to deal with or recover from. Anyone who's had an active life is bound to do something to themselves by 50Plus age. We'd all have been fine if we'd just stayed in that recliner chair-- well, maybe not so fine. Aren't we glad we didn't.
So, every pedal stroke of that 4 miles must have brought a smile. You've probably read a current thread about "2 Miles Ain't So Bad". Same thing. So, keep riding, keep posting. Welcome Back.