International Play

I have another question. I am currently 15 years old and I am interested in representing the US in international play. It says ages are based on age as of Febuary of that year. Since My birthday is after Feb. 1, does that mean I am still eligible next year?
Also, I was just wondering if the US cadet is 16 and under or UNDER 16. Meaning 16 year olds are not eligible. Thanks for your time.