Funny you say that, I have recently had the opportunity to move back to England (where i am originally from). I feel though that because of my age now making it to the higher levels won't be realistic and I'd have to start from scratch all over again. In Ireland though it is still realistic (but heavily reliant on pleasing the right people) due to the lack of younger referees and there being less layers to the top.
at 26 you'd definitely not be too young.
i started at 22 and am now a level 4 at 33 (and have been for 7 years), it's just my own ability weighing me down now!
if you're good enough you could easily be in the football league by the time you're 40 (or earlier if you're really good)