When twice-married Demi Moore tied the knot with a man 15 years her junior, cynics held little hope of a successful marriage.

However three years on, the 45-year-old actress and actor Ashton Kutcher appear more in love than ever as they enjoyed a stroll along a Malibu beach.

And despite the thousands of pounds Moore has spent on plastic surgery and an interest in 'leech therapy', it seems true love is the best way to hold back the years.

Hollywood golden couple Demi Moore and Ashton Kutcher enjoy a romantic stroll along a beach in Malibu

The ever-youthful Moore, barefoot and sporting a little black dress, looked effortlessly stunning.

In contrast, her younger spouse opted for more casual attire of shorts and white t-shirt.

Moore has reportedly spend a total of £220,000 on plastic surgery in the past five years and admits to indulging in a practice known as leech therapy which ancient Egyptian doctors considered as a cure-all.

"I feel like I've always been someone looking for the cutting edge of things that optimise your health and healing," Moore told US TV host Dave Letterman earlier this year.

Funny face: Despite Demi's grimace here, it's hard to believe there is a 15-year age gap between her and Ashton

"These aren't just swamp leeches though - we are talking about highly trained medical leeches. These are not some low level scavengers - we're talking high level blood suckers."

However despite being one of Tinseltown's most beautiful women, the mother-of-three has complained that there are not enough parts for older women in Hollywood.