I have heard 2iu's 5 days a week (Monday thro Friday) is a good place to start for "anti-aging."
Research lots. Bloods. Buy a cheap glucose monitor and check your blood sugar while running it.

My experience with HGH is somewhat limited. I ran it at a low dosage (didn't keep notes) years ago during physical therapy starting as soon as my injury was no longer immobilized. I knew thro others that I could use it during physical therapy. And I regained 100% range of motion, which was not expected given the severity of my injury. I had surgery to reconnect tendons. After surgery I was popping pain killers before going to physical therapy. There was some cracking and ripping sounds as my hand specialist got my hand moving again. Scar tissue breaking lose. The hand specialist would heat my hand up in a machine full of corn cob particles and hot air blowing around, then start bending it all around, wrap it with tape in a bent position tightly until the pain was unbearable, rub the knuckles hard with a rubber mallet, test my grip strength periodically as I regained motion. It was basically torture lol but he did say I healed better than anyone he had ever seen. And those extensor tendons and knots (internal rubberized stitches in the tendons I think) glide freely over the palmar ligaments at the MCP without issue today. I can beat on a bag or do knuckle pushups no problem. I do credit HGH as helping me recover from that years ago.

Edit: if you run HGH make the most of it. If you got an old injury that could use some rehab exercises then do the exercises while running that HGH. Be ready and make the most of things.