Hi Cara - from someone who is 60+.
Eat a very balanced diet, drink a lot of water.
Enjoy your life, don't worry about growing old it is the worst thing you can do, brings out those horrible lines on the forehead. You might get some laughter lines but what the heck you have been laughing not crying!
Oh, choose to use good quality skincare - I use Monsia
http://www.monsiaskincare.com/ their Advanced Skin Renewal System. After starting using Monsia several months ago I now no longer need to wear a foundation or powder because my skin is evening out and it has a natural glow. Now I just manage with blusher, eyeliner and mascara.