wiltw
Subscriber
My recommendations when people see me using my tripod and ask about buying one for their own work:
(1) Buy a good wide comfortable strap for carrying the tripod. I like the OP/TECH USA strap.
(2) Buy the heaviest carbon fiber tripod (a) that you can carry comfortably with the strap, (b) that has no center column - if it has a center column you will eventually extend it and vibration will ensue - and (c) that is tall enough to look at the ground glass or through the viewfinder while standing straight up - your back will thank you as you get on in years.
I am 5'11" tall, about to begin my ninth decade, and use my Gitzo GT2542LS with a GH2750 offset ball head for everything from a Leica IIIc to a Hasselblad 500C/M with a 180mm f/4 lens.
Since you are beginning your ninth decade, you have the privelege of seniority regarding your Point 2.
But another cardinal rule of tripod use is that often the BEST location for the camera may NOT be at your eye level, but somewhere below that point; and by examining the various elevations by eye you can then set up your tripod to its initial position close to that ideal elevation. A younger person should not simply set his/her camera at eye level automatically.