Old age hair annoyances

The grey hair I can cope with - at least it hasn't fallen out. It's the surplus that gets me. Eyebrow hair used to know when to stop growing. Now there's at least fourteen that don't. Is this follicle Alzheimer's or something? Then there's the nasal hair, apparently suffering from the same condition. What the fuck is that for, exactly? What evolutionary purpose does it serve? None, as far as I can see.