Thanks to everyone for your thoughts and suggestions.
I think the answer I gave the young man when he came up to me and asked me about the car was the right one: "not now, maybe in a couple of years"
The car feels like a comfortable old pair of shoes, or a favourite jacket. As someone said, it's basically at maintenance stage, no major work expected, just a few small things that I'll need to get at some time (vacuum pump overhaul or a bit of vacuum hose troubleshooting, and replacing the seals on the crankcase vent tube, to stop an occasional little drip). And some pm (bleeding brake lines, checking the pads, that kind of thing).
So yes, the time isn't right for my parting with my red wagon. Maybe in a couple of years my potential future son-in-law (mech engineer and tinkerer) will adopt it.
And with the low amount of miles I put on, I really do need to look into collector-seasonal plates and insurance. I do take the coverage off in the winter so save some $'s already.
Again thanks for your replies. I appreciate them.
Cheers.

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1983 300TD 240K - 1982 240D 215K - 1996 Dodge Cummins 70K