denberg - I've been running off and on since 1968 and am 53 y.o. There were long periods of time (read years)(after college) (after injuries) etc that I had absolutely no desire to run. Why did it come back? I don't know. All I know is that part and only part of my identity is "a runner". I often hate doing the training but the reward is so sweet; that good feeling, beating the youngsters, setting masters' pr's, and competing against myself.

I'd say don't worry about it. It will come back. And if it doesn't; you've accomplished many years of running and you're not lesser for not coming back.

Running comes and goes.

You want to run some days and others you don't

If you are an avid runner and love the sport then it should not have left you..

I assume something got in the way? Personal perhaps, injury?

However, if you are a runner at heart it will come back, that is my feeling, if it doesn't come back then it was never instilled in you, not to be condescending, but running is a hobby for most and the occasional person participates in it and then grows tired of it, very few in my experience are "runners", lovers of the sport, and the feeling and desire to run never leaves them unless something drastic happens...

That might be your case, or not, i'm not hear to lecture, just giving my opinion.