I hear a lot of pp sing the praises of retinol and tretinol ( sp? ) but I already have sensitive, reddish pale skin that burns easily so I feel very hesitant to try them. Also feel the same about chemical exfoliants that may reduce the skin barrier. I feel like I'm missing out, but I'm too scared to damage my skin to try them! Am I being over cautious? I'm 60 and always looking for ways to improve my skin, I mainly use Korean skincare and Eucerin moisturiser, which seems to work ok for me. Any advice?