If I had a nickle every time I heard "you can tour on any bike", I'd have enough to buy my dream bike with change left over. Yesterday I met a man that proves that very point. I was riding on one of my local rails to trails track when I met an older man named Kim. He told me he rides between 170 to 200 miles a week and has been doing so since he retired at the age of (hold on to your seat) 70. And what you may ask was he riding? A Schwinn. I asked him what kind of maintence problems he had during the last 4 years and he said very little. He told me he replaces the chain every year and put a new wheel on the front because of a couple of broken spokes. That was about it.
If I can do that when I'm 74 I'll be a very lucky man.