Is the question one of financial fitness or physical fitness?
Exercise is the reason I have a second floor apt and my sister is keeping her two-story house. Climbing stairs is good exercise.If you find the climb a problem, perhaps regular visits to a gym will help you get back in shape.
If the joys of home ownership are the big problem, I'd hold off moving until your present home is sold. In the interim, search for an apartment community you like and put yourself on it's waiting list, a rolling list, if possible. That way, you just might be able to walk out your old door and into your new one on the same day.
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