UV damage causes 80% of skin-ageing .No skincare regime is complete without SPF. The damage caused by UVA & UVB is irrefutable. I always advise clients to use a factor 50 SPF - particularly if they are using retinol, having peel treatments or travelling abroad.
Take a look at the images above.These are twins: one twin worked as a gardener outdoors, never using SPF and the other twin worked as a chef indoors, protected from the sun. Look at the difference in their skin quality, pigmentation problems, wrinkles and risk of skin cancer.