New recommendation from the National Advisory Committee on Immunization:

AstraZeneca can be used in people 30+

This is where the supply crunch will become an issue.
Canada has only received 2.3-million doses of AstraZeneca from it's source.
It's counting on 4.3-million more by June.
But no specifics on deliveries with some uncertainty.
So 30+ may still struggle to get quick access.

Also, provincial and territorial health authorities have the final call on this. They decide who is eligible to get a dose and do triage based on supply and risk.
So there's still a lot to be sorted here.

Re-upping this thread so people can get a sense of the anticipated vaccine supply from all sources: https://twitter.com/DavidWCochrane/status/1384589699126284300?s=20