doddery

tutiseva dodder Doddering, trembly, shaky.
1994, Laurie R King, The Beekeepers Apprentice''

That is not to say that he became a doddery old man — far from it. He was just a bit thoughtful at times, and I would catch him looking at me pensively...

The old boy's so doddery now he can hardly finish the course at all. I timed him today. It took him seventy-five seconds...