In the GiveWell article I quoted they estimate an uber-5-year-old life saved costs $7000, for 37 DALYs, which equals about $189 per life year saved. But if it was actually $4500 per life as you suggest, that would be closer to $121 per life year saved or about 5 months of life for $50 instead of 3 months as I said, but I would rather err on the conservative side.
In the GiveWell article I quoted they estimate an uber-5-year-old life saved costs $7000, for 37 DALYs, which equals about $189 per life year saved. But if it was actually $4500 per life as you suggest, that would be closer to $121 per life year saved or about 5 months of life for $50 instead of 3 months as I said, but I would rather err on the conservative side.