I don’t think the OP was making any individual judgments on who was healthy or not (except for perhaps the OP’s son who they would know about) but rather that it is common sense that there are no doubt numbers of people receiving the sacrament who shouldn’t be. There were likely many who were properly disposed to receive but when you see dozens of 16-30 year-olds receiving the anointing of the sick at these masses (going by an example I have seen) it’s either the sacrament is being given to many who shouldn’t be receiving or our young people today are in very poor health overall…
We are going at this from several different directions.
The OP said “it ***seemed like nearly everyone ***in the Church went up to receive it.” (mi bold and italics). As people have a tendency to hyperbole, This sounds like it may be something of an overstatement. Perhaps it isn’t, but we have no information as to how many people were at that Mass (50? 100? 200? 500?) and how many people actually went up.
Recently, last fall/winter, my parish celebrated the Sacrament of the Sick. We had two lines going up, and each line contains about 20 +/- to the back pews; as the church is in the half-round, there were probably somewhere between 50 and 60 people coming forward. The average age range was between 50 and 90+, with several who were below that.
That seemed like a lot of people, but certainly not more than maybe 20% of the people at that Mass, and probably closer to about 15%. I could easily say “seemed like nearly everybody”, but that would be exceedingly hyperbolic as I am generally aware of about how many people actually come to that Mass.
So you saw dozens. Interesting, as it must be a rather large church building. Statistics generally put the majority of parishioners in the “over 50” category, as the age range of 18 to 30 has the worst attendance rate. And since “dozens” could amount to more than 24, and maybe as many as 60, that is quite a turnout.
The problem with that age range is that they are among the groups poorly catechized to almost not catechized at all. One can fault the pastor for not making more of a point about it, but it is debatable if a one to two minute comment about it would even be consciously heard, let alone understood.
Perhaps what you need to get started is something similar to “Theology on tap” (for those over 21) to reach out to them and help make up for the lack of catechesis.