I love how those two sentences are right next to each other... LOL!
I think if you have the means and the motivation, you can do what you wish. 30 is not "old" to be in school, if that is what you are worried about. If anything, you've now got life experience. I am a typical 4th year university student at a typical university student-age. I see 40- and 50-somethings in my classes quite often, and really, they have a unique perspective on things that young minds just don't have. I think you are at a great age if you do choose to go back to school, because you are both a "young mind" and have that unique experience and perspective. You can do it!
On that note, I think it is admirable what you want to do. We all know how few and far between good herp vets are - or just herp vets in general, never mind good ones!
If you really want to work with animals, I know for me personally I'd rather be a vet tech or work in an established zoo or animal rescue versus being a vet, as it's a little more hands-on (and less surgery/not fun stuff). Have you thought about volunteering first?
All the best!