www.aarp.org 
Bill Evans is the man.
Anything that keeps your brain active and inputting new material is good and will help. I've started doing crossword puzzles and this little block game on my Android phone.
Old fucks need to just listen to songs about being young. No need to over complicate things.
One of my guitars is a Yamaha C45M classical. Me likee. I have a cheapie Spectrum acoustic guitar that I would like to trash because I have to tune the 6 string up or down if I use a capo. For example, when I do "Leader of the Band" by Dan Fogelberg, I capo at the 2nd fret.
That’s how I set up PA for live venues. The guitar player has control of the sound he likes, then we just pump it through the sound system.
You answered your own question. It makes us feel better. Some do it to praise God, which I reckon is pretty much the same.
Play & enjoy the strings as much as you can. Had a Martin 12 string & Gibson Gospel (6 string)I played for years upon years. Then along came old age & arthritis. Kills me not being able to play anymore. I played country only and loved playing lead with the 12 string. Keith Potger who played a 12 string (The Seekers) is who inspired me, to switch from a 6 to 12 string. The song in this video is what started me down that path. Everyone in our family played as well, mostly string, but a few wind also.
When I was young & full of life, I wanted to learn all about everything. Then came LBJ and the war, I never have looked at life the same way ever again. I watch young people these days knowing they will never experience the things we were allowed to. Driving a tractor at 8 years old, running a 20 mile trap line by self for 2 1/2 days on a mini bike carrying a H&R 22 at 10 years old. The parents never worried about you because they knew you could take care of yourself, or a neighbor was watching out for you. Being able to buy 80% sticks & caps at 12yo. The pride of knowing your days work was productive at 14yo, & wondering what nicety/enjoyment tomorrow was bringing. Enjoying a 1966 S/S 396 on Friday/Sat/ nights cruising town until 0300. Shaking a mans hand knowing it was a done deal w/o paper work or lawyers. That America my friend, is dead, and never coming back.
Our family was huge and when we had reunions in Francesville Indiana, the whole town would turn out on Saturday afternoon to listen to all the different groups of us playing back in the 50's & 60's. Same when we had them in Winamac as well. Once the bulk of us kids were back from the service they were held at the state park north of Winamac. At one of them the park rangers went to my Grandfather & ask if we had invited "all these people". Grandpa stopped us all from playing and when we stopped & looked around we were amassed at the crowd size. At that reunion (1969) we all played right up until they closed the park, one of the best days of my life, extremely tired, but a good tired.
I would have answered, "Yes, we invited everyone but you."
