RecruitingClinical trialGeriatric Assessment and Technology Evaluation in Prostate CancerBy doing this study, doctors hope to learn more about factors that contribute to frailty (a condition where older adults feel weak, get tired easily, and struggle more with everyday activities) and serious side effects among men over the age of 65 who will receive androgen deprivation therapy (also called "hormone therapy") for prostate cancer that has spread to other parts of their body. Participation in this research will last about 5 years. For the first year, participants will have 5 study visits where they have give blood samples, answer survey questions, and use a wearable device. After study visits are complete, there is a 4-year follow-up period. Research team will check regular doctor visits and look at participants' medical records.