Okay, I may be an old guy but I still enjoy bike riding. My knees are pretty wobbly but I can still manage to putter around. Road bikes are my preferred rides but high pressure tires and gears that cause my knees to complain don't always make for a comfortable ride, especially here in N. Georgia. An old mt bike that I acquired a couple of years ago with it's wide tires, low gearing and drop bars that I added was comfortable but didn't quite satisfy me. So last year I bought a 1986 Specialized Stumpjumper Sport frame and fork that was sound but had a bad rattle can paint job. I had some downtube posts brazed on and a candy-orange power coat job and proceeded to build the bike. Used new, NOS and old refurbished parts. It's about 90% finished. Thinking about some lighter wheels and Aluminum fenders. The bike now weights ~26 1/2 lbs minus the rack.
The bike really turned out nice and is very comfortable with the 44mm tires, long wheelbase and low gears. Matter of fact I'm so happy with the way it turned out that I put it on ibob and some mt bike forums. As the frame cost $99 and some of the other parts were already on hand, it didn't cost much to build. The candy-orange powder and the downtube shifters make it pretty distinctive.
I've been pretty wordy here but the point is, if you are an old guy like me (74 yrs in a couple of months) and you don't have big bucks to spend you can still build an attractive, comfortable bike.