So you are telling me somebody thought it was a good idea to bucket 10 year olds with 59 year olds in a study regarding health outcomes. Can you think of any c

So you are telling me somebody thought it was a good idea to bucket 10 year olds with 59 year olds in a study regarding health outcomes. Can you think of any confounding issues among those samples when split only by vaccination status? Like maybe the median age or percent with AARP memberships?