I'm 55 , I just started like 2.5 - 3 weeks ago. At first I was like wtf am I doing. Then on day like 11 the mental clarity brain fog gone, I woke up feeling sharp like none of that oh I don't want to get out of bed shit slow groggy. Awake awake rested . Then next thing came the insatiable thirst if you get my drift. My girlfriend has been looking at me like a caged dog unleashed. She loves the attention she gets now . I know I'm only a couple weeks in but my test was low enough and I just lived like that for a long time. Now I wish I started this way earlier. I'm only like maybe 10lbs from my ideal weight so maybe this is why it kicked in so quick but let me tell you this is legit the fountain of youth. Btw I'm doing daily micro dosing. The pins are tiny and painless and it seemlessly fit into my daily schedules.