Hi
Age can be a problem for some, but certainly not for everyone - I have seen some postings recently from 18year olds who've passed their interviews.
I am awaiting my interview (next week). This is the second time I have applied, first time I was 18, just completed a-levels, and unfortunately I failed due to "lack of maturity/personal impact when pushed for a decision" and was advised to apply again in a year. But that was just me, and I'm hoping that won't be a problem for me nearly 9 years on!!!
I guess that, due to your age you should expect to be tested in this sort of area during the interview, but forewarned is forearmed. My advice to you is to be confident in yourself, but equally not over-confident - if you can manage that right!!!
If NATS weren't going to recruit any 18 year olds, they wouldn't let you go through the selection process, so it's up to you - good luck
