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Retin A for Anti Aging?

hi , I'm 42 old male and just wanted to start the Retin A for anti aging , I wanted to know that as I have never used Retin A , at what strength should I start ? 0.025 , 0.05 , or 0.1 % , also I'm wanting to know if Tretinoin Gel ( Microspheres ) at 0.04 % would be a better choice given between a Cream or a Gel Based Tretinoin / Retin A ? pls advice

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