Typically, most sunscreens have oxybenzone as a prime ingredient.
That will block burning uvb rays.
but if you are looking to prevent aging on the face,
you need something with avobenzone as well as oxybensone.
I use Neutrogena Ultra Sheer. It also has helioplex that will lengthen the
effectiveness.
Don't make the mistake of getting cheap sunscreen, you wont burn,
but uva rays penetrate deep, and you will still age quicker.