 And it's a process, but it's worth it. The procedure was done at the Mayo Clinic in Arizona as part of a clinical trial. Nine other patients are enrolled. Steve Kathan, CBS News. Be thankful, especially if you're not a spring chicken. A new Harvard study finds conscious gratitude may help older adults live longer by lowering the risk of cardiovascular disease, cancer, respiratory and neurodegenerative diseases, as well as injury and infection.