Hey.
I went back to school and entered vet school at ... um ... 42? I think? 41? Fairly similar story - had a successful career, comfortable financially. My wife did not / does not work, though, so we had just the one income.
The biggest question you should ask is not whether you can get in and regarding the cost of pre-reqs -- you can manage that stuff, I promise. And even if you spend the money and don't get in, that's a much less big deal that the lifestyle change you're talking about if you DO get in. You can recover from the pre-req debt and the emotional distress of not getting in - but once you get in you're committed financially.
-- Really sit down and think through the cost picture. Think about how much debt, what the payments will be versus the income, etc. There are some good debt calculators and other info. Here are a few links to start:
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Student Debt Center Landing Content
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Student Debt Center - VIN
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Personal Financial Planning Resources
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Financing Your Veterinary Medical Education
But you need to consider how you'll maintain your lifestyle (or a lifestyle you find acceptable) during school and after school and you need to be brutally realistic about the debt given the payments and the income for a new vet.
-- Consider what life will be like IN school. Lots of married people are in school, and most do just fine, but it can be super stressful. You will be very, very occupied time-wise with school, and your spouse has to be ok with that. When you get out into practice your schedule will stabilize some, but expect to be still pretty highly occupied with work for a year or two while you get your feet wet. My wife basically single parented for most of vet school, and it was hard for her. She's only now starting to feel like she has a life again, so don't underestimate the impact to your partner/spouse.
-- I wouldn't work as a vet tech if you want to be a vet. The job is different. They are underpaid drastically for the work they do. And, the time you take to gain the credentials to do that job (unless you mean taking a job as a non-credentialed vet assistant or whatever the equivalent is in your state) and the money it costs take away from your future earnings that you'll need to get good financial footing back. If you want to be a vet as an 'older' second-career type, you need to find the most direct path possible.
-- Given your academic background, I personally would do the pre-reqs as cheaply as possible, ensuring that wherever you take them will meet the requirements of schools to which you plan to apply. Some people will tell you to avoid a community college because of perceived 'less rigor'. Ignore them. You already have proven yourself (and the 'rigor' thing isn't really necessarily true to begin with). But
do make sure that wherever you take them, they meet the requirements where you will apply. Some schools care, some don't.
-- Start getting experience and find out if you really want to do it. You shadowed and whatnot in your younger years - you may have a different perspective now. Get back out and start shadowing again and making contacts and see if it's still something you want to do.
Best of luck. Feel free to PM me with specific questions. Do not be offended if I don't reply right away, I tend to go through very available vs vs busy life cycles depending on whether I'm working.