Have you looked through the "So you want to be a Helicopter Pilot thread? (in this very forum, Rotorheads). If you follow "CLICK HERE" in it, you'll see an "Am I too old" thread... read that. There is a lot of (varying but good) advice. In fact, read, digest and consider everything in there.
I'm no expert (my licences are PPL) but I wouldn't call early thirties too old by any means, but quite soon, you will reach the stage where the years start to count double! I've still not abandoned the idea yet (for rotary), and you have a decade on me! It depends on so many things though, your life and circumstances, money, family etc., before you even start. Read everything related you can get at, and be brutally realistic with yourself.
Other people will maybe add to what I've said, but quite honestly, it really is all well covered in the threads I mentioned.. better to spend some serious time reading that lot, then ask anything specific that isn't there for you.
Best of luck!