I've done them off and on since 21, for 15+ years. Most cycles were low dose to todays standards, and I was lucky enough to not need TRT even as I approach 40. For those that weren't so lucky, I feel for them. I can't imagine having to inject every day/week at this point in my life. It would just be a pain in the ass (literally) with all of the travel I do for work, and with kids, wife, etc. If you have the genetics to be on stage and make a career, maybe, but if you just want to be big and jacked to impress your buddies I don't think it's worth it.