"I'm a lot older than you so I've experienced more." And when he says a lot, he means a lot. He knows that he doesn't look it which is why it's always amusing to tell someone just how old he is.

"You're not that miserable." Which can also mean that he's not that pathetic. His way of thinking is different than Geralt's but that's not surprising. They're from different worlds.

He reaches for his drink and downs it easily before shrugging a shoulder. "And I think that'll be fine once you allow yourself to...have fun."

Or whatever you want to call it.