Way too many are making assumptions that because they are over 30 they are not getting called. Several posters have said they were over 30 when hired, this suggests that you can actually be over 30 and still get through. I also know someone over 30 who has recently been to an assessment with Ryan, so it is definitely possible and not worth speculating.
Trust me, there are plenty of young guys in their early twenties who haven't failed a single flight test or exam and have waited for months and even years without getting a call from Ryan (I am one of them and I know many more). So I am sure other factors play a role, and I believe luck is one of them.
I understand you want something to blame for not getting called, but your age probably isn't the reason.