According to the American Academy of Dermatology, the best cosmeceutical that can aid in preventing and reversing the signs of aging is sunscreen.
*** NOTE THERE IS NO TAX ON SUNSCREEN***
We recommend physical sunscreens (zinc /titanium) with SPF 30 because they don't degrade quickly like chemical sunscreens do. The amount that a SPF is above 30 does not make much difference. But the "15 SPF" in your makeup is chemical and too low to protect you, so don't be fooled into thinking makeup or a moisturizer alone will protect you!
FYI - The order of application is as follows...anti-aging/antibiotic first, then a moisturizer if necessary, then sunscreen and then makeup.