okay so I want to make a CS for this but I have a few questions

1 What are these "Aliens" Like?.
2 Why is the maximum age 29? On a average military the Maximum age to join is about 40, and also everyone leaves university around the age of 20 which means everyone would be a absolutely Fresh-out-of-college recruit who barely knows anything, 

and space ships obviously cost a lot of time and money to build (unless they don't.) which means it would be stupid to hire fresh-out-space-academy people which could seriously jeopardize the ship

Also with a age restriction that low it seriously restricts the possible things people can RP as, like for an example a Battle-Hardened Veteran won't make sense if hes 29 years old 

yeah question 2 is more of a rant than a question [@Erklings25]