Just to clarify things here because it has come to "everybody in their 40s starts losing testosterone" myth again.
It is estimated that 20% of men above the age of 60 have low testosterone. Secondary hypogonadism in healthy men below the age of 50 is extremely rare and most of the time it's people who have used or abused steroids or steroid-related substances in the past.
Rookie Hammer Squad 2015
Frankie Edgar - Dominick Cruz - Jorge Masvidal - Cat Zingano - Holly Holm