So far, it seems Korea has the best data over the situation, and is likely the most applicable for countries with proper public health and medical systems.
Per Korea's Ministry of Health and Welfare - http://ncov.mohw.go.kr/upload/viewer/skin/doc.html?fn=158337...
As of today, 150K people tested, 5766 infected, 35 death, 0.6% fatality rate. Their age distribution looks interesting:
0-30: ~2k infected, and no death.
30-50: ~1.5K infected, 2 death (0.1%)
50-59: 1127 infected, 5 death (0.4%)
60-69: 699 infected, 8 death (1.1%)
70-79: 288 infected, 13 death (4.5%)
80+: 127 infected, 7 death (5.6%)
Their number of infected graph is showing some sign of deceleration - the growth rate seems to be leveling off or slowing down slightly.