Hey at 57 you don't have a lot of seasons left to waste one not riding.
Sell the bike for what you've got in it and move on.
Nothing like a "glass is half empty" attitude! They changed my retirement rules recently so that I'll have to work until I'm 65. 57 doesn't sound so old at all to me!
As to the original question - I agree with the person who stated that the main thing to consider is whether you derive lots of pleasure from working on bikes or do you just like to ride?