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Q: I have heard that the use of daily sun protection can help slow the aging process, is this true and how would I know which one to purchase?
A: According to The Skin Cancer Foundation, 90 percent of premature aging and skin cancers are caused by sun exposure. So what you heard is true—SPF can help slow the aging process. The biggest challenge is to know how to read the numbers on the bottle. Sun Protection Factor (SPF) numbers relate to the length of time that you can stay in the sun without burning. Most fair skinned people can tolerate 10-15 minutes in full sun. Multiply that baseline period of ten minutes by a SPF of 15, and you get two and half-hours of protection or 150 minutes. And what about the laundry list of ingredients on the label? Always opt for a cream that screens out both UVA and UVB rays for the broadest protection possible.
Source
A: According to The Skin Cancer Foundation, 90 percent of premature aging and skin cancers are caused by sun exposure. So what you heard is true—SPF can help slow the aging process. The biggest challenge is to know how to read the numbers on the bottle. Sun Protection Factor (SPF) numbers relate to the length of time that you can stay in the sun without burning. Most fair skinned people can tolerate 10-15 minutes in full sun. Multiply that baseline period of ten minutes by a SPF of 15, and you get two and half-hours of protection or 150 minutes. And what about the laundry list of ingredients on the label? Always opt for a cream that screens out both UVA and UVB rays for the broadest protection possible.
Source