Bold - it is terrifying, isn't it. Life can turn on a dime - you never know what's around the corner. 40 is a blessing.
I recall a thread on here a while ago - it was from someone about to turn 40, or in their 40s, and it was to all 50-, 60-, 70- and 80-somethings, along the lines of, 'what would you like to tell your 40-something self.
You often see threads asking people what they'd tell their teenage self. Well, this was similar.
The responses were so fab. Honestly, it was one of the best threads I've read on here. Really made me appreciate all that is good right now, and to make the most of still being - and looking - relatively young.
Instead of moping over the ageing process, I try to focus on all the good stuff - more confidence, more income, lovely family, friend, holidays, looks still just hanging in there. Still being alive!
Right now is as young as you'll ever be, you might as well enjoy it!