As far as you're concerned? Perfectly.

( He answers bluntly, bringing the cup up to his lips again. )

You're retired. Don't ask questions that future-you won't be able to get out of your head.

( He's not being jaded or bitter, he's not saying you're ignorant, so as far as you know we're good. What he's saying is, the less Steve knows the more likely he is to enjoy that retirement.

So.

Mum's the word.

Plus, it makes for a convenient cop-out for Natasha. )