After 43 years on this planet - almost half of those working in the beauty industry - I thought I knew the ins-and-outs of skin better than the average person. I was certain I knew exactly what my own skin needed, liked and agreed with. I had it sorted. Then, things changed. I'm not talking about the natural developments that come along with the privilege of ageing - I knew lines and uneven tone would incrementally increase - the change is more around what my skin is 'asking for'.