The first sentence is the wrong start.
I hope you' re healthy, so don't worry.
I'm just 60 and in retirement by illness since nearly three years.
But in this way I could be lucky, no problems to drive cars (Morgans), motorcycles (my dream Harley) and bicycles (a really big collection of british Reynolds stuff). I know about some guys telling the same thing as your first sentence. Sitting at the table, lucky if they look out and do: nothing. Only looking out and breathe.
So it sounds silly: put up your ... Stand up. Stand up is the first step. And this could be heavy. If it's done give this step a sense.
Have a look in the garden, at your Mog, at your wife, at your bike.
A Morgan is a great thing for retirement. That's a point we bought our one last year, get great days out, look if it (she/her) needs a little TLC, get it "customized" and a lot of other ideas. Or visit your dealer, the factory or a workshop at BHM.
Or read Mr. Ws book... Help some germans with Iphone to send their pictures (you see... Someone is around who need your help) ;-)
Welcome in the restless world of retirement!
René