They kill and eat each other in tanks pretty often and take a long time to grow to maturity. It's possible, but still not as profitable at scale as hoisting them from the depths where they aren't kept together for long.

Call Kenny Loggins and ask him

Being in the top of your age group physically and mentally probably helps. It's really hard to get selected to become an astronaut and requires a lifetime of fitness and study. You have to be exceptional in every way to get into space. It's only in the last decade that money was enough to achieve spaceflight. Before that, only the best and the brightest elite pilots in the greatest air force on planet earth made that cut. (Or whatever Russia does) Here's a list of current requirements to be considered for the Artemis program.