I used to be one of the sound engineers at the House of Blues in Cambridge. One night, while I was mixing a long since forgotten band up in the sound booth, I turned around, and there was Mr Fleetwood, standing right behind me, all six feet seven inches of him (or so....he's very tall). He kind of scared me. We said hello, and I went back to work.
His hair wasn't gray at that time.
I met a lot of celebs there, the nicest one being Tom Schultz from the band Boston. He is also super tall. From what I understand, he is also a pilot.
Another notable was John Entwhistle from The Who. He was pretty intoxicated. I said something to him, and he said, "what?", and I said, "damn dude, all those years of playing too loud has really f'd up your hearing, eh?". His response was, "it wasn't the gigs, it was the damned studio engineers turning up the headphones too loud." yeah right.