I am almost 40 and in the past year or two I have started growing a noticeable moustache and some pretty magnificent sideburns 
I am leaving the sidies well alone (they’re blonde ish) and am immac-ing the tache every few weeks.
Anyway I’ve just come to terms with this new beauty regime and now I’ve noticed with some horror that the hair on my head now seems to be thinning at the front 
Is this a common but rarely discussed side effect of ageing?? Could it be stress related? (I have a very stressful job atm). I dye my hair myself (dark browny red) and my natural colour is now grey/white.
I don’t think it’s damage from the hair dye as it’s not that the hairs themselves are broken/snapped. It’s just there seems to be fewer of them these days, at the front near my face...