I'm 62, recently picked up a '88 Dave Scott Ironman Expert the P/O had converted to ss/fg. It's my first foray into FG and I'm enjoying it so far. I'm a randonneur; we'll see how far I want to go on FG.
I've replaced the flat bars with drops and lowered the gearing to 42x16. That'll do for mods for the time being. When the 25mm tires wear out I'll put on some 28s for long distance comfort. I'd go wider but that's the limit.
If it turns out I like this FG rando thing, I'll have to upgrade. Wider tires, fenders, dyno. But I'm getting ahead of myself. I'll do a series of 100k ride, and see how I feel about carrying on.