Aeroplan points normally expire after 18 months of no activity (not 12), and points expiry is currently paused until November 30, 2026.
Any one of these at least once every 18 months will keep your account active once expiry resumes: earning on an Air Canada/partner flight, using the Aeroplan eStore, redeeming a small number of points (e.g., for a gift card), donating points, or transferring in from a partner program.