Redfoot sex and age guesses?

[JessKeen]

Hey guys! I took some pictures of the little guys tail before his soak. I'm curious if the experienced keepers here can tell if my tort is a male or female from visual signs. The plastron is slightly concave.

Also, I know age is much harder to guess, but any ideas? I have never seen a tort grow so I have no context. He's farm bred if that helps. Shell is just under 6".

 

[ZEROPILOT]

Six inches. My guess would be 5-6 years old.
I can't tell if the plastron looks concave on my little phone. It could be a young male, but still kind of young to tell.