Another perspective:
The risk of a 75% old man to die in a given year is 3.5%. And the risk of the same person to die of a Corona infection is 8%.
If we assume there's a 50% risk of infection this increases the total risk of death this year from 3.5% to 7.6%. That's about the same risk as the risk of dying either this year or next year (if the virus wouldn't exist).
I'm not surprised that a lot of people aren't too worried. Yes - large numbers of people are going to die, but the risk for each individual (including older people) is not significantly higher than the risk of dying anyway in a given year.