Maybe...We are studying medical terminology in this skill section, and the older you get and the more you travel, the higher the chances that someone might say this to you in a hospital in France somewhere. It happened to my neighbour when her husband had a brain aneurysm while holidaying in France.
Surely someone spoke english, you might ask? Eventually yes, but not intitially and not the medical jargon needed to discuss these types of things. Not that we would be likely to remember this sentence if our partner had just had a ruptured aneurysm....
Thanks for your comment Puppy. Well... the context you mention seems to be the exception on the rule. Not one method can include all the different expressions that could be useful at some stage of life, especially not at this level of mastery. There will always be an expression that you have never heard of. I would say that in the 20 years that I lived in France, I can't recall using it or having heard it: but I was younger, then, of course. Danger mortel or Danger de mort would be more commonly said than the above. In medical jargon this would translate as: Ses jours sont en danger as risques de mort sounds a bit too direct.
I agree completely about no method being able to cover everything and thanks for your insights into how this may possibly be phrased in real life. Perhaps the "risk" phrase would be used in medication info or even on ski hire disclosure forms?? It is often cited in french articles and forums about SIDS. Ies risques de mort subite de nourrison. I usually try to think of these exercises as giving us useful grammatical constructions that we would recognise if not use :)
I had no 'of' in my word boxes, in fact the word choices were very limited. This is not everyday English. We would say 'there is a risk of death', unless we were specialising in insurance assessment, or something?! This plural has been translated too directly from French to English, resulting in a decidedly odd, grating phrase.