I dont have any scientific fact, but my own experience is , that when im running a full out high dose AAS cycle I feel young ,I feel in control and like a superman ,I am in my mid 30's now and with the AAS I feel invincible and when im cruiseing at a low dose I feel like a slug , and more than that when I used to PCT and do without AAS I felt worse than worse .
So my conclusion is ,AAS makes me feel great and younger
skin is always tight and tanof course ,
High dose makes me feel great
Low dose makes me a slug .....Just saying