Deciding ROI to society is what the government does.
Consider questions like: Why did we spend so much money trying on a Covid vaccine but not to cure gall bladder cancer? Why does eminent domain exist? Why do young men have to register for selective service?
Devil's advocate, assuming limited resources for the program, it makes more sense to invest them in younger cohorts in terms of total ROI to society.
However, surely doesn't satisfy the principle of equality under the law. Alas