YES If we are faced with a tragic choice, as doctors already have been in some countries because they do not have enough ventilators for all the Covid-19 patients who will die without one, then- other things being equal-it is more important to save younger lives, because younger people are likely to live longer.
The “other things being equal” clause is essential. I am not suggesting we should put a 40-year-old with incurable cancer on the last ventilator rather than a healthy 70-year-old. The illness eliminates the usual expectation that the younger person will live longer.