I'll second the teeth comment, the posture comment as well
Good haircut and colour
Good quality clothes...particularly a good bra to life your norks up...saggy norks make anyone look older
Not too much makeup and spend spome money on a good base for under your foundation. The la prarie rose illusion line filler is brilliant if expensive.
A heated eyelash curler helps to open up your eyes and makeyou look younger and more awake
Have your eyebrows plucked professionally - can give the impression of an eye lift if well done
SLEEP!
Lots of fruit and veg
Being the right weight - not to fat, not to thin...you need some fat to push out the wrinkles
pay attention to your neck and your hands - they give the game away in terms of age....exfoliate and use a good cream on both, plus sunscreen every day. Also don't forget your decolette...no point in having a wrinkle free face and crepey skin lower down.
Exfoliate your skin on your face - icrodermabrasion once a week. Basically if you scrape all the dead skin off your face cream will sink in better and your makeup will sit better on your face
Use a serum at night (estee lauder night repair - it does work), followed by a good cream and an eye treatment
these are the things I do anyway