Would you prefer taxes go up instead
Yes.
Yes.
He retired last year. He didn't have an easy life. Very few jobs would benefit from his work and continuing working would have a great toll on him.
If you want your parents to retire earlier than the population-averaged system can allow, you're free to do it a non-averaged way.
If he voluntarily chose not to raise kids, not even adopted ones, then he placed himself at the mercy of strangers. This may or may not end well, depending on how much spare resources they have.