There is a lot of data available about the COVID-19 situation in Montreal, Quebec and the world. Asymptomatic cases and mild cases are much less likely to get tested, so they won't appear in the overall number of confirmed cases. Now Quebec wants to focus on health-care workers, hospital patients and people in long-term care institutions. It means more lead time for the government to add more hospital beds, if it looks like they'll be needed. The other key piece of information related to the age of COVID-19 cases is each age group's share of the total number of cases in Quebec.

Source: CBC News April 02, 2020 00:27 UTC