How old is TOO old??

I post this under the 'Safety Issues' heading as after many years of fun and enjoyable RV adventures, I must be realistic and make appropriate plans for our future.
My first RV experience (more years ago than I care to admit) was my grandfather taking my brother and I on a 'camping trip' in his 1940 Buick Roadmaster over the Tioga Pass in springtime and tent camping at Mono lake and yes, there was still snow on the ground. That gentleman taught me more that I can ever explain.
Now, I'm well into my 'Golden Years' and I do so like to travel each spring & summer to new places and meet new folks. (I am certain there are many friends I just have not yet met.)

BUT...the '97 MoHo is aging and I'm putting in the $$$ to ensure it is roadworthy and comfortable. Replacing rusted tanks and perished hoses is easy! But the 'nut behind the wheel' - is not easily upgraded. At 79, I am wondering how much longer it is prudent (and safe) for me to drive a class "A" on the highways. I 'think' I'm a good driver (no accidents in 20 years - other than when on a mountain road, an on-coming driver crossed over the yellow line and forced me into the guard rail to avoid a head-on!). I don;t want to quit and sell the rig too soon - but then, in this situation, better to be two years too soon than two weeks too late!!

I have set myself a goal of birthday 82 (3 years from now) to get off of the highway - unless I should sooner loose sight, depth perception or reaction time - then it would be immediate. Right now, I know I am slowing down, but am still a safe and prudent driver - but there are so many younger folks that do not understand that 55 MPH get's you there in just about the same time as 65 MPH! (Yes, I'm the double-nickle driver in the right lane - getting good mileage too!).

So' I'm raising this situation to find the views of the many folks that are actually enjoying their RV time - and seriously consider my earlier retirement if appropriate.