Here's something to think about when you consider aging and re-reading:
Re-reading something after a number of years can be just as fresh as reading something new, as memory is a notorious trickster and it's entirely possible that you -- yourself -- may not be the same person you were (or thought you were) back when you first read it.
I should think that too many books and not enough time might be a pleasant "problem," but it's a funny thing, this business of time.
Our time is limited from the day we are born. Intellectually, we know this, but most of us don't really grasp it until we've already spent far too much of our time. I told a story in here a couple weeks ago about finding a library in a strange town where I was trapped for my summer vacation and how funny my family thought that was. Twelve years old, "wasting" his summer in the library.
Of course, what they didn't know was that I wasn't in the library at all.
I was in Middle Earth . . . or maybe I was on the HMS Bounty, or Pitcairn Island . . . who remembers?
The point is to go wherever you can as often as you can for as long as you can, and if the places you like to go are places you've been before . . . places you trust . . .
Well, what's wrong with that?
Your post was a pleasure to read and your thoughts spot on.