Good on ya Harvey! You lend fact to one of my favorite beliefs. "You don't stop playing because you grow old, you grow old because you stop playing!" One more believer here in checking the action to start. Maybe switch to lighter gauge strings. Proper technique is important. Wrist and hand positions that strain can do damage. Carpal Tunnel for one. And if the fingertips aren't sitting on the fretboard as they should you may be putting too much pressure on a sensitive spot. Also , no offense, but as we get older our skin thins out a bit. If you have a harder spot in a callous, like a corn on your toe, that presses down into uncalloused flesh , it'll hurt like hell. I know. See your Doctor because it may be possible to remove it or shave it down. Everyone is right though. If it hurts something's wrong. Take breaks. Play different songs. I've found making sure the songs I'm playing don't have a lot of the same chords, gives my hand a bit of a break from straining. I don't play too many songs in a row with full Barre chords. Switching to a few songs with more open chords, or playing lead for a while, practicing scales and such keeps my hand from getting .... bored I guess. Welcome back to the wonderful world of making music. But get the offending fingertips checked out by a physician. If it hurts so much you decide to stop playing again you'd be losing a great source of enjoyment. Take care sir.