Article continues below advertisementStacy London feels like her 50s might be her best era yet! "I am almost 57 years old, and I'm probably the happiest I've ever been in my life - and that is because of everything I've dealt with throughout my life," the fashion guru exclusively tells OK! while talking about AbbVie's PSO Done Campaign, which encourages people living with psoriasis to reflect on how their symptoms are being managed and to have transparent conversations with their dermatologist about their care.