I was curious if heavier weight classes in the UFC correlated to older average ages of fighters. Here's what I found: : r/MMA
Mixed martial arts weight classes - Wikipedia
Men's And Women's UFC Weight Classes - Martial Nerd
ESPN MMA - Which UFC weight class is your favorite to... | Facebook
Caged Steel - We're introducing a new weight class system for fighters on Caged Steel. We feel in recent events within the world of MMA this will lead to safer weight cuts