Questionable
My thoughts on this are why is an 18-year-old kid lurking about casinos? There are many other things that an 18 year old needs to be doing to assure their future, such as educational pursuits that would leave little time for much else. Next of all, just how much bankroll does an 18 or 19 year old have on hand to invest?
A short bankroll is the number 1 reason people fail at this ballgame. As taught in any small business class, the primary reason for the over 60% of all small business failures starting up is lack of start up capitol, with the rule of thumb being "have enough capitol to cover any and all overhead for at least 6 months without bringing in your first dime". A grueling negative swing can last for a long time, for months even. Did you deliver enough newspapers or flip enough burgers to float that?
This brings me to the next reason people fail at the AP ballgame--- experience. A lack of experience combined with a very ridiculously POSITIVE swing early in your "want to be an AP" career can make you feel invincible... unbeatable... just on top of the world even! This can cause the inexperienced player to play in a manner that puts their ROR higher than it ought to be and add just a few ugly mistakes or lack of judgment to that situation and you could be headed for disaster before you even know what the hell hit you. The casinos eat these people up for breakfast and think nothing of it... after all, they are there to whack you for all it's worth and they have the upper hand. It takes a shrewd hustler to hustle the hustlers!
Most rational 18-21 year olds are thinking about college or in college and not thinking about slumming about casinos and CERTAINLY not thinking about how to break laws by trying to use false ID. In Atlantic City they will relieve you of your chips, arrest you and if you have the right sort of young boyish appeal your cellmates will wish to reenact scenes from "Deliverance" with you, leaving you thinking "Gee, I could have played it a bit differently and been going to the University of Michigan right now instead of being asked to squeal like a pig".
I realize this all sounds pretty dismal and the worst-case scenario but "look before you leap". This is a tough racket and only the best survive... this is no joke, no fooling around. At 18-21 age range, you have your whole life ahead of you and this is a critical timeframe in which your decisions right now have a huge impact on what happens to you for the rest of your life career wise. You have LOTS of time to evaluate playing some blackjack and make all preparations to do it correctly, logically and at the best possible advantage for you instead of "half-cocked" and at more risk than you should put yourself in. Those casinos don't have all those well-paid employees and that huge lighting bill because everyone wins.