I think I probably qualify for this thread now. Speak up son! 
When your co-workers are mostly your kids' ages, and they've noticed... and nobody ever says 'you don't look old enough for that' any more 
I'm definitely getting to be a grumpy bastard, middle age has found me creaky, knackered and rattling like a chemist's shop. What I have left on top is a nice 50/50 blend of silver and black nowadays, though the beard's mostly black still. What I don't like is the encroaching baldy bits and the amount of daylight you can see through the rest. Especially when my youngest gleefully starts poking at new bits of scalp to make sure I'm aware of it. Cheeky little shit.
Hair can be an odd thing.
My beard has been gray since I was 40-ish. Now at sixty eight years of age, my beard has whitened and I've grown it past my collar bones down to the bottom of my sternum, Civil War era style. I keep it trimmed and kept looking, but massive.
My head hair is still light brown with only small singles of white scattered through.
I had a lovely fiftyish coworker come to me one day and compliment me on how I kept my hair colored so natural looking, but wanted to inform me that they make products for men's beards that can do the same.
She was stunned when I told her I had never colored anything and it looks natural because it is natural.
My brother is the opposite. He had grey hair early on, but to this day (he is sixty six) his beard is still mostly dark with light wisps around the sideburns.
I like my giant Viking beard!
... but I am getting tired of my hair down past my shoulders. Caring for it is a handful.
Thinking of buzzing it off again and leaving the beard but I always thought that looked odd on bald guys with massive beards.
