Ex-American cyclist lance Armstrong said that he began to use drugs at the age of 21, according to the Yahoo link on ESPN.
“I was, in my opinion, 21 years. I started to use cortisone on the course of the first season as a Pro in 1992, a year before winning the world Cup.
Then EPO (Erythropoietin) brought us to a completely different level. The effect was such, that all began to use this rocket fuel. We had no chance to refuse him.”
Recall that the lance 7 times won the prestigious Tour de France. He dominated between 1998 and 2005, but then admitted to doping. After this he was deprived of all titles won after 1998.