When Should I Start to Use Retinols or Retinoids?

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I think every woman above the age of 30 should be using retinoids, and even you can start earlier if you have a lot of sun damage. But again a lot of times it's the 30 year olds that come and say oh my God I'm freaking out because my skin is getting older what can I do? And I start every single one on some form of some a retinoid whether it's over the counter or a prescription.