I went back to vet school when I was 27 and I am now 32 and 4 weeks away from graduating as a vet. I am in Australia though and did not have to do "pre-vet" I just went straight into vet school which is 5 years. While I am glad to have made this decision, vet school has been no easy ride. The hours of study required are quite incredible. I hadn't done any science since high school either and before vet school I did a bridging course in maths and chemistry. If you can do something like this I recommend it.
Being at vet school means that most of your spare time is taken up with study. It is also quite stressful as there are a LOT of exams, including oral exams which I find nerve wracking. In my final years of clinical rotations I sometimes would put in 36 hours at the hospital without sleep. There is also financial considerations as no income for 5 years is hard to take.
That all being said and done I am really glad I am going to be a vet. As a mature age student I have been more motivated and had better discipline to study than when I was younger. I don't think you are ever too old to go back and study. If it's what you really want to do I say go for it. It's better to try than to live with the regret if you never did it.  |