I will be 33 next month and I am just starting vet school this fall. There were a lot of serious issues I had to work out in my head before doing this; and I spent the last 2 years making huge sacrifices so I could get all the classes / experience I needed to apply, not knowing if it would pay off or not!! Well now here I am, accepted for c/o 2013.
I am very happy but I would not go around for another cycle had I not been accepted. I also decided halfway through this year's cycle that if I didn't get into my in-state school that I would not go. It's just a huge debt to take on in these uncertain times. Money is a huge factor, and something that needs to be seriously considered.
It is important to remember that there are other careers that are just as special and have less schooling / debt load. For me personally, had I not gotten in I would have gone for an MPH, 2 years full time and starting salaries at $70K+. I also considered PA, about the same stats for that. Vet school? Triple the debt load, 4 years and starting salaries around $60K. People always talk about the "passion for the animals" but let me tell you, that get's real old real fast when you are struggling to pay your loans every month and still living like a pauper even after you are a DVM. Just ask some of the new grads out there.
Anyway, it (amazingly) worked out for me - I got into my in-state, my SO will be coming with me, and my mom even offered to kick in $10K / year (yay for mom!).
So I will happily be off to vet school for the next four years. As for starting a family? I have to feel that out still. I don't have any kids yet and I will be 37 when I graduate. I figure I will try to have 2 kids immediately after school, then embark on my career. But of course that is all up for debate.