The first mistake I see in women is trusting that they are getting enough sleep. Lack of sleep or erratic sleep patterns reek havic on your looks.

I love Jurlique Purely Sun-Defying Moisturizer with spf 15 cause it also has anti-aging properties. It blocks UVB and UVA rays.
If you do need to use a foundation use a lighter weight one for the appearance of younger looking skin. Heavier foundations settle in fine lines and accentuate them.
Also stay away from shimmery eyeshadows on mature skin. They also can really accentuate and draw attention to wrinkles. Try using matte shadows instead.
Then smudge a thin line of eye pencil. This will pop the eye and create a youthful appearance.
Simply and beautifully.
Find Jurlique Purely Sun-Defying Moisturizer with spf 15 here