I am about your age, 65 and half, but personally I still think that a padded but narrow saddle, like mine
Selle Italia SLR (I actually recycled an older model from my previous acoustic bike), now pretty old and worn out, remains the best solution.
But of course it depends on what kind of use one makes of the bike, health conditions, etc.
Instead, I was surprised by the usefulness of the mobile seatpost. I found it standard on the bike I bought thinking it was a gadget useful only in very difficult conditions or for "sporty", young people. Instead I found that it is incredibly important, especially on steep descents. I move it up and down all the time...