I think you may have missed the point. It's not a matter of more old people, it's more old people relative to the rest of the population.

The excess death numbers reported will happen because more people live longer in the EU than in other places. Those excess death numbers can't be sustained over time, because our population pyramid will gradually resemble something more like yours.

Alternatively put, if the EU population pyramid resembled the US population pyramid we wouldn't have the excess death numbers that have been reported during the heatwaves (because most of those people would have already been dead).

It's not the case that people are boiling in the streets. It's more similar to COVID-19. People who were going to die relatively soon die earlier. That's what excess deaths is.