It always has been 18 for the age limit and ladies, disabled etc...can all fish for the England Senior team..
If there good enough and qualify then great....they deserve their place....
A few anglers have been good enough to go straight from the youth team to the senior team, but via qualification when they are 18
from memory i believe the following all qualified straight from the youth team (although i may be a year out ):-
Nick Arthurs
Joel Beeney
Phil Dixon
I personally think that the age restriction is correct....The kids have a lot on, GCSE'S, A levels etc.... Training and development days with the Youth team..fishing in the big open matches(TFEO & Anglian)......as well as the Youth International.
It's a good grounding for them in competition fishing, you don't want to throw them in the deep end or they may just sink rather than swim.....they may just feel that they don't enjoy it so much and so give in....