I think it's his appearance in 'The Two Doctors". Being about 16 years after his regeneration (in real time), we should expect him to look a bit older. In universe... he got hit by a hair whitening ray?

ok make sence until his out of carahter TV appear on TV in the 80's where it was 20th anniversary and he had grey with bits of brown

Fixed

I don't really see the reason behind her pining, it just starts almost immediately in S&J. Sadly, the appeal of her getting over him is ruined (at least for me) when she (seemingly) dumps Tom for Mickey so RTD can make another Smith and Jones joke.

But I understand that people really like her and I respect their opinion on the matter. I just don't, and likely won't ever, agree. Certainly my Doctor Who tastes aren't the norm.

There's a norm? Why weren't we informed?

I suppose I should have said the vocal majority. It amounts to more or less the same thing as it tends to be the 'perceived norm'.

Nope, Second Doctor had black hair.

Thanks like I said I thought it was brown but 4th and 8th still my fave due jelly babies

Fun fact: While Tom popularised the jelly baby thing it actually came from the second Doctor.

It first happened in The Dominators, but then showed up again in The Three and Five Doctors

Awesome let ole to it to return with the 12th