Hi!
I applied 3 years ago from Austria. A friend of mine kept the newspaper-article which read:
" You should be single, between 22 and 30 years, be between 5'2 and 5'10 (female) / 5'6 and 6'2 (male) in height and have good eyesight without glasses (however, contact lenses are acceptable). You will aslo need to be educated to secondary level. Fluency in written / spoken English is essential "
Mark it - that was 3 years ago - but as far as I know they haven't really changed the limits - only, as some before mentioned - in some countries they are not allowed to "voice" them...
So - you might be 34, in the UK they might still invite you to the interview (because they might have to - no age-discrimination)... but: they'd probably also find a reason or 2 why not to take you but the 27 year old, single next to you instead...
However - it's always worth to give it a shot - you never know, they can be flexible sometimes...
Good luck anyway! If you go to the interview - just have fun, be yourself - and who knows... we might meet in Dubai!
Cheers,
Eli