How to explain ATC to normal people

Hello, super random but, Im a on my 2nd year as an atc training on local now. I’ve recently started dating a girl and i keep putting to the side trying to explain my job without getting to complex but also kinda make it not seem super simple. And ive always wondered how to properly explain to normal people like old friends and family members etc. thanks for the advice

And also if i get my cto in the military in the next few months (ill be 21) does the age limit still apply to me if i reenlist and then go into the FAA afterwards