If you are thinking of working as cabin crew strictly for the money, perhaps you should consider another line of work. Cabin crew, especially at entry level, aren't all that well-paid. Those who choose the career do so because they like the work.
That said, there are some definite perks that come with the job. You'll get free or much-reduced-cost travel benefits with the airline and its 'partners', and once you gain seniority you'll be able to bid on working flights to exotic destinations (starting out, you'll be much more likely to be flying to Milwaukee or Peoria than to Milan or Paris). Working as cabin crew isn't necessarily incompatible with going to college or starting a family.
It will require a deal more flexibility and fortitude (from your loved ones as well as from yourself) than if you were working a 'normal' job. If working as cabin crew truly appeals to you, I'd recommend exploring the opportunity as early as possible (once you turn 18). In the unlikely event that you don't pass the training (if you're not a complete ditz or klutz, you ought to pass with flying colors; it's not rocket science after all) then you'll know the worst and get an earlier start on discovering an alternative path to your long-term goals.
If you do pass, then you get to start on a career where the sky really is the limit.
Cabin crew is a career; not a post high school job.
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