Prevent sun damage. Sunscreen is the real fountain of youth. Get into the habit of applying sunscreen or a lotion with minimum SPF 15 to 30 protection daily. Remember that the sun's rays can still be damaging in winter months as it reflects off snow. If you don't like taking the time to put on both moisturizer and sunscreen, buy a moisturizer with sunscreen.
Cleanse your face gently. Don't clean so much you dry it out.
Exfoliate. wikiHow contains detailed guides on facial preparations, masks and scrubs. Experiment to discover what works for you.
Live a healthy lifestyle. Quit smoking. Few common items age the skin as effectively as tobacco. Eat a healthy diet which includes many fruits and vegetables. Reduce stress when possible.