Well it looks like (as usual) our opinions are split and we all have our personal preferences. I personally do not have a lot of 'training' time so I just keep doing ny normal riding of 1 - 2 rides a week of 10 - 20 miles each. That keeps my skin tough enough to not have a chafing problem and ensures I have a bit if a physical base. When I start to tour I just plan 2 0r 3 ramp up days, 40 the first day or two then 50-60 miles, then whatever after that. I considered riding 40 nile training days with a load, but then realized why do that and wind up back at home when I can wind up 40 miles away from home on my way to wherever.

For comparison, I am in my early 50s, in generally good physical shape (but not exceptional), and I have been doing an annual summer tour for the past 8 or 9 years. I tour with friends at a 14 - 15 MPH pace in moderately hilly areas, self supported and really do not care about my pace as I an out to enjoy the ride regardless. If I am in poorer shape I drop the pace a MPH or two for the first few days. Longer days for me (loaded) are probably 60 miles.

By ramping up on the tour at a comfortable pace every day I still am completely enjoying every day of the tour and manage to do it without a rigorous training schedule.

If you want to start out riding 100 mile days at a 19 MPH pace in hilly Pennsylvania,you may need to train first, but that takes the fun out of it for me at least.