No. Either your agent is wrong, or you're misquoting him. (And by the way, there is
no reason at all to be using an agent at this stage, who can do nothing to improve your chances). You've said elsewhere that you are a Japanese citizen, and you are in the pool waiting for an invitation.
Japanese citizens can participate in IEC 18-30 inclusive (
http://www.cic.gc.ca/english/work/iec/eligibility.asp?country=jp&cat=wh&#country_category_name). If you are drawn from the random pool before your 31st birthday, then you can apply. Fortunately for you, there are currently more spaces available than people in the pool, so you are likely to be drawn before your 31st birthday, but there are no guarantees (it depends how slowly they draw). If you are still in the pool waiting for a draw on your 31st birthday, you will be removed from the pool, and you will be no longer eligible.
If you get drawn from the pool while you are still 30, then the actual processing of your application can indeed go past your 31st birthday, that is not a problem. But you must be drawn from the pool before you become 31. Simply being in the pool at 30 is not enough to make sure your application is valid.