Gandalf's beard was also said once to "stand out stiff like bristling wire" - he's probably got very thick hair - I'm not at all surprised his eyebrows stood out. He's also got excellent forehead muscles - all that brow-furrowing & worrying has built up quite a foundation for all that hair.
Or maybe they're extendable? I remember he "stuck out his bushy eyebrows" at Bilbo in anger - does Gandalf have retractable eyebrows?
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But all the while I sit and think of times there were before
I listen for returning feet and voices at the door
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