Hey <b>Bill</b> - I know exactly where you're coming from.
It's not that your arms are getting shorter - it's just that the world is getting darker
If only there was as much light around as when we were 20, we'd see just fine.
Seriously, though - everyone's eyes change shape as they age, making reading glasses (or more) a certainty for everyone lucky enough to outlive their good eyesight.
I'm at +1.00 reading glasses now (the weakest) but I hate it! You do not suffer alone, my friend.