If you wear sunscreen (stable and high PPD) all the time, and use a rx retinoid in PM, that will help longer than until say 55. My mom's 67 now and has been using both since she turned 65, so not long, and has amazing results.
If you have stayed out of the sun and never tanned for all your life, it's really awesome how the skin looks. My MIL is like that with almost 70.

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