Coronavirus has been around and when kids get viruses, 1/3 are thought to be from the coronavirus family. Hence kids tend to develop some immunity to coronavirus and are less susceptible to this new type from Wuhan. Thankfully.
Coronavirus death rate may not be as high as 2%. As it goes round more humans, it should tend towards normal influenza rate of 0.1% to 0.2%. It is high now partly because it is concentrated in 1-2 Chinese cities whereby the healthcare system is tremendously strained. 
Masks are less effective than handwashing and maintain 1m from others (since the virus is not airborne, only aerosol). According to the WHO website, proper handwashing, avoiding contact of our own hands (unclean) to our eyes. nose and mouth would be more important. 
https://www.who.int/news-room/q-a-detail/q-a-coronaviruses

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