Something that pisses me off about getting older is that just as everything is heading south, I finally have the confidence to wear anything I fancy and genuinely don't care what anybody thinks - or rather, I've finally realised that nobody gives a monkeys...
When I was in my teens/twenties, pre- DC, tall, skinny and everything perky, I was so shy and self conscious I wore long skirts, loose jeans and floppy tops. I would love to be able to go back and give myself a slap - and a pair of skinny jeans and some mini skirts 
But more on subject - I keep my hair long because I think it still suits me that way. And I refuse to go grey, ever. I still have skinny-ish legs, so I wear skinny jeans/trousers or shortish skirts (with thick tights). And I keep to the rule of legs out or cleavage out, never both, because I do think you have to be young to get away with that.
I also realised a while ago I had drifted into the trap of still shopping where I had 20 years ago - Next, Dorothy Perkins... and hadn't realised that the clothing ranges there had aged with me, and not in a good way. So now I go in H&M, New Look, Top Shop, etc. You have to be a bit careful as some items scream teenager, but their basics / jeans, jumpers, shirts etc, are just cut in a more modern, young style, which helps me to not turn into the dreaded 'frump'