russ148,
The aptitude tests and interviews are there to look for people who may have the right aptitude to become ATCOs. They are not there looking for people already qualified as ATCOs.
Although the tests are far from perfect they are looking for that certain something which you either have or not, age doesn't reflect that. You may be 40 and useless and 16 and perfect.
No doubt if you have been reading through all the threads of late then you will see the starting salary through the college is low, there is a good chance therefore that the age of many applicants will be a lot younger than in the past.
There seems to be way to much worrying and panic from people going in to the tests, you can prepare yourself for interview and if you didn't you would have to question your desire to do the job but the aptitude tests are there to judge one thing and one thing only, do you have the aptitude to train to become an ATCO. Go in do the tests and take from it what you can. There are plenty who are young who pass, and a good number told to come back a year later.
To everyone here stop getting so stressed out by it, if you are stressed by tests you wont go very far in ATC.