Am I too old to start over?

I’m sure this question gets asked a lot, but I need some advice. I have ZERO experience teaching. Right now I’m in safety (for general and construction industry). I get paid well but I really don’t like what I’m doing. I’ve always felt a calling to teaching. But… I’m already 35 and don’t even have my degree. I could probably get one from WGU in 2 years. By then I’ll be 37. Is that too old to start all over? I’m in Nevada. There’s a demand for teachers where I’m at.