The distribution of age of corona patients on the ICU is NOT the same as the age distribution of all corona patients vs. disease severity. It could be and quite possibly is the case that many people below the age of 50 are infected but never reach an ICU. Most get better without severe symptoms, so looking at ICU admission stats is misleading if you extrapolate the data to the whole population.

I hate that this fact is spreading in the Netherlands without a proper explanation.