I am 29. I am satisfied with my skin condition but want to do laser treatment for anti-aging purpose. I have fair, normal-to-dry skin. Which one of the two lasers would be more suitable? Is it a good idea to do them alternatively as they target different layers of skin? If so, in what frequency should I do each one? How long before and after the above 2 treatments should I avoid using retinol? Do I need to stop using vitamin C before and after them? Thank you!