From the SHA:
Effective 8 a.m., April 22, 2021, eligibility in the provincial age-based immunization program moves to age 44, except for the Northern Saskatchewan Administration District, where it remains age 40 and older. This applies to all immunization clinics: booked appointments, drive-thru/walk-in, and mobile.
NOTE ON CHANGE TO ASTRAZENECA ELIGIBILITY: With the recent change to the minimum age for use of the AstraZeneca vaccine, residents should be aware that any one of the three approved vaccines - Pfizer, Moderna, or AstraZeneca - may be offered at their chosen clinic. All are safe and approved for use.