32-year-old Sean Stewart is over the moon about his new relationship with 51-year-old Adrienne Maloof -- telling TMZ, "I'm very happy ... She's a very very very good lady" ... and anyone who criticizes their age difference is just SEXIST.
Stewart was out in L.A . today when he addressed rumors he'd already moved into Adrienne's pad -- just weeks after they started dating -- and he said, it's just not true ... "I actually have my own place."
But things got heated when the topic turned to the couple's age difference -- Stewart said, "If men can date younger women, why can't an older woman date a younger man? It's sexist."
He added, "It's about the person she is inside. Age is just a number. If there's a connection and someone cares about a person, that's what matters really."