Got this article today about prevention of Photoaging. It outlines the same concepts as many posts here are about. Like: sunscreens, retinoids, antioxidant.
Maybe you'll find it informative.
I would like to underline one part especially:
"Most sunscreens are
designed to prevent UVB-induced sunburn; even broadspectrum
sunscreens boasting of a high SPF (>20) may
allow significant amounts of UVA-induced free radical
generation to occur. Sunscreens with better UVA blocking
ability (zinc oxide, titanium dioxide) (4) are probably more
effective in preventing UV-induced photodamage, and
should be a necessary part of the arsenal against photoageing,
especially in persons with lighter skin types engaging
in prolonged outdoor/leisure activities."