So I am 80, ... take it easy with the old jokes.

What your asking is almost impossible to say, could be from that's too cheap to that's too much.
I think that's why there are no reply's.
Here is what I (a nobody) would suggest as a .solution to your situation.

Ask him what he needs / wants for it and then you should buy it to keep, and / or fix it, and / or sell it (if you want to).

Now you will know exactly what the price is. .