The fact that lifespan isn't an issue in that case is a logical conclusion AND relevant to the topic.
What are you even arguing? There is no debate since you denied having an opposing viewpoint.
Who said I was arguing. I'm asking you for your conclusion. So far you've offered no conclusion from the data. Look if you want to add to the debate, make a conclusion. If not, just yield. There's no shame in admitting you thought there was something interesting but forgot the correlation is not causation.
You need to learn that population health statistics provide very little data for interferences. It takes controlled studies (AB, ABA, etc.) to make meaningful interferences. You should have learned that in week two of your first college-level stats course. If you need help, I can refer you to several course presentations.
If you're planing on saying your conclusion is something like: "Overall health has worsened for children during these years." then you have to rule out all sorts of causal links: better detection, expanded detection, earlier detection, increased reporting, more accurate diagnoses, and so much more. You don't want to make an "ad tempum" fallacy, right?