Freida Pinto says that her real life boyfriend Dev Patel is so 'philosophical and mature' that she has to remind him to act like the 21-year-old he is.

Patel, whose latest movie 'The Best Exotic Marigold Hotel' is currently in cinemas, is much younger than his 'Slumdog Millionaire' co-star girlfriend.

"Some people don't actually know that he's six years younger than I am!" the Independent quoted Pinto as saying.

Despite that the actress doesn't think he is to young for him because of his 'old soul' nature.

"He's too mature. I keep telling him, 'Stop being an old man!' He's just an old soul. The way he speaks and thinks - he's so philosophical and deep. I'm like, 'You don't sound like a 21-year-old to me!' At least that was not how I was when I was 21," she said.