Yes your entirely right. Plus it is easy to be complacent about other peoples health. The risks scale up almost exponentially beyond 70.
In point of fact, this is the last time I will visit EP without an N95 grade face-mask. I will most certainly wear gloves from car to car today.I'm 65 but have low lung capacity and asthma. Medics concur that if I contracted the more severe S strain I would need oxygen.
As somebody who has a son who has lived in China for 9 years and my other son's partner is an A&E doctor,I can see how this COULD pan out. Any responsible person should minimise the risks to their own health and ramp up their approach as the probabilities change.