never too early to start wearing sunscreen everyday! prevention > treatment.
but to address signs of aging, I've seen it recommended that we start on retinoids usually around our mid-twenties.
I think you can start whenever. it’s better to start to prevent aging rather than wait and try to reverse aging . just like it’s easier to start weeding a garden as you go rather than wait until it’s a big problem and try to fix it. if damage is done it’s already done
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