They go just fine! There's a video of Steve Clark (one of the designers) foiling and he's in his late 50s and likely in the weight range you describe.
You'll need the kind of fitness you'd need to handle a Laser in a good breeze.
The big thing with foilers is that it's tricky to get started, to get past the initial learning curve, because you need
- a very particular boat and rig setup
- some techniques that are very counter-intuitive for a sailor coming from conventional boats
So my strong recommendation is that you find someone who's foiling a UFO (or a moth or a wazsp) in your area and hang out with them, do your first couple flights alongside. I can offer that kind of friendship in Miami
A couple more resources
- I've written the unofficial owners' guide for it https://docs.google.com/document/d/1mEjNqTfleXX2sS3nMUZI2tGcwFLzrTzPxNjSRwO-lTA/edit
- Kelly Federal has some excellent videos on learning how to foil it https://www.youtube.com/@kellyfederal/videos
- There's a lively forum thread in the Sailing Anarchy forums https://forums.sailinganarchy.com/threads/steve-and-dave-clarks-unidentified-foiling-object.176284/latest
hope it helps!