TejanoTrackie 

Well, if you’re too old at 49, then I’m dead at 74. I would definitely go lower on the gearing, though, maybe an 18T freewheel. At your weight, those 23mm wide tires are way too skinny. I’d suggest going up to 28mm wide, so you don’t need to inflate them past their maximum recommended pressure. As to tools, about the only thing I can think of is a 15mm wrench for wheel removal, a freewheel remover, and a chain tool for a 1/8” chain. I see no reason to change the handlebar; a riser bar makes the most sense for casual riding.