There's no legal bar, but your age will make it very difficult to get enough points to migrate. You are probably eligible under Federal Skilled Worker, but unless you can get 450+ points, you won't really have much of a chance.
This is probably going to tell you that you're eligible. However, the next step is to check your CRS points (assuming you are eligible). You can do that here -
If you have more than 450 points, you have a very good chance. However, you are likely to have a score that's in the 330-360 range, and that's much too low.
If you're married and your spouse is younger, you can see if they get more points.
The other way of migrating is via a job offer. If you can get a job as a principal in Canada, you can get 50 more points and that may be enough to qualify. You can come here and work even without migrating as a PR.
However, I have no idea whether it's possible for you to get a job here. I suppose that depends entirely on you - where you are currently, your experience, potential contacts in Canada, etc.
The other way of migrating is via a job offer. If you can get a job as a principal in Canada, you can get 50 more points and that may be enough to qualify. You can come here and work even without migrating as a PR.
However, I have no idea whether it's possible for you to get a job here. I suppose that depends entirely on you - where you are currently, your experience, potential contacts in Canada, etc.
Principal roles are very difficult to secure (tons of competition - very few roles). I don't see how it would be feasible to get a job offer as a foreign worker which would require an approved LMIA. IMO there's zero chance an LMIA would ever be approved for a school principal since the Canadian recruitment requirement could never be met.