Yes Paul, I understand this and agree with you, it's not going to happen, however, once retired it is important for me to learn something new as to delay as much as possible the alzheimer and other brain destruction/decay ... here, two very close neighbours, about same age as me, have already lost contact with the real world, and it's scary, very scary, and seems even more so when it happens with people one has known for half a lifetime.
And yes, sometimes I'm quite ashamed about the low quality of my musical output, and learning new tunes goes very slow, so I had converted a little Hohner Lucia from the 1930's to a reedless midi accordion as to be able to learn without annoying the whole house (with a headphone); and yes, my little grandkids learn faster on the piano than me on the accordion, lots faster, but that's OK, that's life, and as long as my body stays healthy (average healthy) I would like to try to keep my brain as (average) healthy as can be.
Thanks for all your very interesting posts!