The 20-year-old "Wrecking Ball" songstress appeared on the NBC show on Monday, where Lauer asked the former teen queen if this new sexy side is just a phase.
Cyrus said, "I heard when you turn 40 things start to go a little less sexual. So probably around 40, around that time, I heard that’s when people don’t have sex anymore."
Lauer laughed and asked if she knew how old he was. When she guessed 40, he declared he “loved” her and told her he was actually 55.
Then Cyrus really let him have it. "Well, then you’re really, definitely not sexual.”
"Today" took to social media to ask viewers to sound-off on people over 40 having sex, while Lauer’s co-hosts continued the ribbing on Tuesday. Lauer even tweeted, "I'm Matt Lauer, and I'm too old to have sex.”