Don't worry about being 60 and alone. I was over 60 and alone in 2001 when I hit the roads in North America, never having driven on the WRONG side of the road. After 25.000 miles in 20 weeks I headed home having seen a great deal of your country.
By the time I went home after my 10th trip in 2021 that came to just on a quarter million miles, touching 49 States (Alaska 4 times) over a total, combined period of almost 5 years.
Much of it is documented on this site. The memories both good and bad, are unforgettable, printed on my mind, and shared with all who care to listen.
Lifey