The bike will be fine. The book "Cycling past 50" by Joe Friel has some good advice for us old farts. While training, especially at our ages, more is not always better. Quality riding , while often not as much fun, is more beneficial than "just riding". I took one of my longest tours (so far) at the age of 64, 3650 fully loaded miles. I really believe that bike touring is more about our mental atitude than physical condition, age, or the kind of bike we ride. Good physical conditioning and the bike may make long rides easier; but mental toughness is equally or even more important. I'll bet that you will be ready in less than the 2 years "to get cycling legs"! Good luck