However, the CDC said it still doesn't know the ages of nearly half of those with coronavirus. (The 20-44 bracket in the chart above is a much larger age range than the others, which is why its case total appears high.)The CDC has advised people over 60 and those with underlying health conditions that make them more vulnerable to the coronavirus to stock up on supplies and avoid venturing out of their homes except when necessary.Of the 44 coronavirus deaths the CDC analyzed, 20 were among people ages 65-84 and 15 were among those 85 or older. No one 19 or younger has died yet from the disease, according to the agency. A large number of deaths — at least 19 — have been connected to an outbreak at a nursing home in Washington.The death rate of coronavirus is roughly 3.4% worldwide, according to the World Health Organization, but that number doesn't fully capture how deadly the virus can be for older populations.The chart above reflects the findings of a study by China's CDC that collected data from more than 44,000 confirmed coronavirus patients there through February 11. South Korea's total death rate as of Wednesday is about 0.97%. That's far lower than the death rates in other countries. A major factor could be the country's extremely thorough coronavirus-testing policies. As of Monday, the country had tested more than 274,000 people. That allows health officials and the public to pursue more effective and widespread quarantining of infected people and their contacts.Italy is under a nationwide lockdown, and its hospitals are overrun with coronavirus patients. On Wednesday, the country reported 475 new coronavirus deaths — the highest single-day death toll of any nation since the outbreak began. Read more: 2 charts show how the coronavirus outbreaks differ between the US and South Korea Countries that are on lockdown because of coronavirus Multiple experts say up to 70% of Americans could be infected with the coronavirus and 1 million could die if no treatment is found — so people over 60 should 'stay home unless it's critical' What to know about the coronavirus outbreak in 17 charts and maps