The older, wiser voice is a TV classic. We've seen it properly used in shows like The Wonder Years, where the squeaky voiced Kevin gets to become a man in the future. That's puberty. We get it. His childhood, while often rough, made him a stand up guy.
What we don't understand is why a grown man, like Josh Radnor, somehow turns into Bob Saget when he's older. Like, Mosby begins telling his kids this very, very long winded story, which includes all of his hook-ups (No thanks, Dad...), in the year 2030. As far as we know, there is no such thing as a second puberty, where your voice sounds like one thing when you're in your late twenties, but then becomes something like a man with a polite TV career but a really filthy stand-up set. God, if the second puberty does come, please don't let us sound like Rodney Dangerfield.