Are any of the people in wuhan dying of coronavirus young people under age 50? what proportion of the deaths were in people under age 50?

Most older, not all: So far, the large majority of deaths from novel coronavirus (nCoV) have been in older persons and those with other serious health problems, like COPD, serious heart disease, dementia, etc. However, infection also can be very dangerous and even fatal in otherwise healthy, young persons -- including Dr. Li Wenliang, one of the first Chinese doctors to alert the public about nCoV.