But even in the Netherlands riding a bicycle _is_ dangerous for some groups. In 2014, the age distribution of those killed in traffic on a bicycle was:

  -  0-15: 13
  - 15-20:  8
  - 20-30:  6
  - 30-40:  5
  - 40-50: 16
  - 50-60: 16
  - 60-70: 27
  - 70-80: 56
  - 80+  : 38

Yes, over half the people killed riding bikes were 70+ years old. That is a cause for concern for planners, and they don't know yet how to tackle it. As always, it likely will be through a combination of factors. For example, technical solutions are being developed that warn cyclists about traffic coming from behind, but e-bikes likely need a good look, too, as their rapid acceleration and (for the elderly) high top speeds seem to play a role.

It is not so much a cause of concern that elderly people are advised to stop cycling, though. The benefits of exercise and of the independence that cycling brings the elderly are thought to more than outweigh the traffic risks.

(Also, chances are that soon, fewer people will die in traffic in a car than on a bicycle. 2014 already was close, with 187 vs 185; see http://statline.cbs.nl/StatWeb/publication/?VW=T&DM=SLnl&PA=...)