I applied a few weeks ago before the legislation came into effect. At that time, there was no age limit specified on the recruitment site. That may have been foresight by NATS.
Obviously I'm not in a position to judge, but I don't see how age should be a deciding factor. The factors should be; ability to do the job, dedication to the cause, suitability for the working conditions. The only time that age should be considered is to decide if it is worth investing thousands of pounds in someone given their time until retirement.
If there are those in the organisation that want to "weed out" the oldies, then I hope my 28 years of existence aren't too many.