There was this famous study in whites that showed their skin progress after 5 years of regular daily sunscreen use compared with those that used it sporadically
And it showed their skin actually decreased in wrinkles, fine lies, freckles etc ggthe sunscreen gave their skin a chance to heal without the constant bombardment of rays everyday
And if y'all are regularly exfoliating and using products to treat dark spots, lines etc and are not using sunscreen your just wasting your time and money because without sunscreen the rays are just reversing all your progress and in most cases damaging your skin even further because the exfoliating leaves your skin more susceptible to skin damage to the new layer of skin