MGUS is asymptomatic unless it progresses to MM, which happens in a small percentage of cases. I am 70, so 62 when diagnosed. My Kappa/Lambda ratio has been gradually ramping up, but still MGUS. MGUS is a waiting game so there isn't much one can do outside of taking care of oneself, staying healthy thru diet, exercise, minimizing stress, and getting enough sleep. Getting diagnosed is hard, and there is grieving associated with slapped upside the head with one's mortality, but it can also be an opportunity to see if you need to make changes in your life. ResearchGate is a good source for peer-reviewed papers on MGUS, MM, and other science.