Portfolio is everything.
Whatever how old you are, if you do have a great portfolio, good art sence and skill, there must some company would like to hire you.
Certainly, younger is always an advantage.
Don't give up, make yourself better then those teens, you must have a chance!
by the way, I can't read your online portfolio XD
I am also looking for a chance to step into the industry of game development. Good luck^^