Like you, I've had fasiculations for years-- actually more than two decades in my case. I'm 72 and am in good health. When I was about 50 I woke up one morning with twitching in both calves. I consulted a neurologist and after extensive testing he was unable to diagnose the problem. Internet searching at that time led me to the conclusion that it was likely BFS. The calf twitching occurs every few seconds and has never let up. It was initially a source of great anxiety, but after seeing the MD and with time I became used to it.
In the past few months I've experienced more extensive fasciulations, mainly in my thighs but also in my arms and hands. I had not had faciculations in these areas previously. My primary care physician was unable to find any explanation for the increase in symptoms after blood work and an overnight oximetery testing, and he referred me to a neurologist. I'm due to consult with the neurologist in early December and afterwards will report back to this forum.