Adding deca to HRT (100 mg/wk ish) is becoming more and more common place for older guys, specifically for joint issues. Age mgmt docs are prescribing it and even some urologists. Everyone is different, best way to find out is to try it for 6 months and gauge your response. 500 IU a week of HCG IMO should be a mainstay to keep intratesticular testosterone levels normalized and maintain testicular mass. I combine both cyp 100 mg every 3 - 4 days and 500 IU HCG same schedule, have considered Deca 50 mg/wk but HCT runs high with regular donations, I don't want to push it, but old joints are no fun either and living on Celebrex has its own set of risks. Deca will increase erythrocytosis more so than T so keep and eye on HCT. >52% donate blood. I used to run Deca (script) only for 10 years for HRT along with 350 IU of HCG 2x/wk. Worked just fine when combined with the HCG, no issues with ED or libido, with the HCG.