Romps with wrinkly ROD, 69, sends young missus top o’ the pops!

LADIES of all ages still swoon when Rod Stewart belts out his hit, “Do ya Think I’m Sexy?”

But no one melts like his 42-year-old wife Penny Lancaster – be­cause she and Stewart, who turns 69 on Jan. 10, are said to have one of the hottest sex lives in Holly­wood.

When it comes to making love, “Rod’s voracious!” leggy blonde Penny squealed to a pal.

“I knew he was a ladies’ man, but he usually tires me out!”

Stewart married third wife Pen­ny in June 2007. She’s mother to two of his eight children, and the British rocker claims he’s com­pletely faithful to her.

“Rod never dreamed that he’d have such a sexy young wife at his age,” said the pal.

“So he treats Penny like gold. And when it comes to romance, he knows how to knock her off her feet.

“Rod wrote a song about Penny called ‘She Makes Me Happy,’ and two or three times a month he’ll have the nanny watch their two boys so he can whisk her off for a romantic night out. Sometimes they’ll just take a walk on the beach, but other times he’ll treat Penny to a lovely dinner followed by a night of passion in a hotel.”

While the lovebirds have no special plans for Rod’s upcoming birthday, Penny is planning a big bash for his 70th next year, said the source.

“This is one Hollywood couple that’s in it for the long haul,” added the source. “They’re incredibly happy and very much in love.”