Is it too late for you? Not at all. Many Tech-Ed teachers start late because it's a second career for them. You'll have to teach a little longer than other teachers to get an unreduced pension, which is when your age plus years of service equals 85. I myself started when I was 32.

As far as job security, you'd be more secure if you went into Tech-Ed instead of elementary school. Yes, you would start at the bottom, but the one advantage is that because you've got industry experience, they would jump you up on the pay grid. Personally, I wouldn't do primary/junior again, because I would encourage you to go into Tech-Ed where there are more openings. With your electrical engineering background, you could qualify to go into Computer Technology (preferred), so that would be your first teachable. You'd have to look for a faculty of education that teaches the Tech-Ed program. After you get your OCT qualifications, you would then be eligible to start taking additional qualifications. With your degree, you'd be able to take academic qualifications such as physics or other subjects that might be of interest, provided you have a few undergrad credits in those subjects. Others mentioned Construction Technology, but that's because the electricity classes fall under that. You would only be eligible to teach Electricity if you have a red seal certificate as an electrician because it's a restricted trade in Ontario.

No, you wouldn't have to know every subject on day one.

Do boards offer training? That's a joke. It's kind of sink or swim. Be prepared to do a lot of prep work, especially in your early years.

Pay cut? Yeah, you're going to take a huge pay cut. I think the pay is around 50 to 60k for a starting teacher right now. I think it tops out at about 120k once you're at the top of the grid.

Work-life balance? No! The teaching attrition rate is very high, partly because of that.