Hi Genghis,
Is that for qualified applicants or their training scheme? I'm sure that wouldn't apply to, say, an RAF ATCO leaving the service.
OK, it's been a year since I went through this so I'm a bit hazy but from what I remember, yes, I think 30 is only the max for the training scheme, but unless you've come from the military (which presumably there's a cut off age for too) it's very tough to become a self-made ATCO and it's difficult to find work.
Just seems to eliminate a whole group of people who reach their mid-thirties, find they are a very different person from the one they were at 18 who set them on the path to their current career and are highly motivated to learn the trade.
If we're capable of working until 70, surely we're still capable of learning a demanding discipline at 31? Not that I know the slightest thing about this - I am mainly just a bit indignant on my friend's behalf.