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When we talk about the elderly, the number of lives saved becomes meaningless. We should use QALY or at least months of life extended on average.

Imagine a very old and sick person gets vaccinated for covid and this extends his life expectancy by 2 years. It won't be fully enjoyable life, probably still on wheelchair and full with health crisis but it is better than nothing.

Now we can compare how many QALYs were gained by antihypertensive medicines, by statins etc. and see the actual cost-effectiveness. Covid vaccines probably were quite effective among elderly but as now statins are generic and very cheap (£2 per month on average in the UK) and covid vaccines quite expensive (£50 per dose) I doubt that the gains are greater than for statins. I vaguely remember that statins provide additional life expectancy about 7 months on average. It doesn't sound much but on society's level that's quite impressive.