How do they detemine how many cardinals?

The number of cardinals, or members of the College of Cardinals in the Catholic Church, is determined by the Pope, who appoints new cardinals during consistories. The total number can vary, but it’s traditionally limited to 120 voting cardinals under the age of 80. Additionally, cardinals over 80 years old, while not eligible to vote in papal elections, are still considered cardinals and contribute to the overall number. The Pope also has the discretion to create new cardinals as he sees fit, which can influence the total count.