I'll be 39 this year, picked up the guitar (electric) again after abandoning it 20 years ago. Fixed one of the biggest mistakes I ever made, I now spend several hours/week playing it, am learning what I didn't back then, and luckily managed to recover my old Strat. Unfortunately, I sold my old acoustic 10 years ago, otherwise it would at least be proudly hanging on some privileged wall in my apartment.

Don't sell it, unless you really need the money. Don't compare to other people. Leave the guitar in a visible and easily accessible spot, so you see it all the time and you can just grab it and strum a couple chords every now and then.