I'm 37 years old with an olive complexion just started to see the effects of aging with some fine lines, uneven tone and pigmentation. A Therapist at a Skincare Medical Clinic advised me against using Retin-A and said I should use a less harsh Retinaldehyde product. Also that long term use of Retin-A thins the skin and makes it hyper-sensitive and a tide of long term users with very fragile skin are appearing. Is this correct? Is there any published research into long term use of retin-A?