There was an interesting article I read some time ago.
It stated that before the arrival of what we regard as modern medicine most people didn't live past the age of 40 and this was true for most of human history.
This was why elders in a society were so valued, there were relatively few of them and they had seen more of life than most people, hence their opinions about things carried a good bit more weight.
It's also why women tried to have about as many kids as they could because a significant number of them wouldn't make it past childhood.
So the grim reality for most of human history ( if you were lucky )was that you lived about long enough to get married, produce babies, raise them, and then when they were old enough to get married and produce babies of their own, it was basically time for you to die.
I don't think it would be deliberate, but no deal certainly has the possibility and perhaps even probability of a certain amount of population decimation due to a shortage of medicines.
Certainly people in general becoming poorer might also prevent them from being able to afford life-saving operations.
A country of our modern era is playing with fire if it allows its medical capacity to become greatly diminished. The UK's new " hostile environment " towards foreigners apparently of all stripes isn't going to help at all if there is a rapid decrease in the population at large.
I hope all the leavers past 40 realize that it is they who will most likely represent this thinning.