A pair of identical twins have just celebrated their 100th birthday and named their secrets for a long and happy life.

Bill Casey and his twin brother Jack celebrated their centenary together with cake, drinks, and friends at a retirement home in Oxfordshire, England.

Photos from the celebration show the pair enjoying themselves in inflatable crowns and holding their birthday cards from King Charles.

Bill is the oldest of the twins by ten minutes and enjoys an artistic life, having taken up painting in retirement. And he always makes time for his health, with 20 minutes of exercise daily.

Reflecting on his 100 years, he named the computer as the most important invention in his lifetime, with all its “amazing possibilities.”

When asked what he credits for helping him reach this impressive milestone, he credited “clean and healthy living, staying active, sheer determination, and good genes.”

“I always intended to reach 100 and now it’s here, I’m looking forward to the next 100!”

His advice to young people was to “have an interest in sports – and keep yourself active.”

CHECK OUT THESE GALS: Neighbors Celebrate 101st Birthday On the Same Day–Living Next Door to Each Other For 4 Decades

Originally from south London, the twins both joined the army in 1945 as members of the Royal Electrical and Mechanical Engineers. They spent 15 months in Malaysia, with Bill confessing they “got up to lots of tricks being identical twins.”

Bill met his future wife, Joan, in Wales in 1951, and they married and had son. They settled in Surrey, England, where Bill worked as a skills and training instructor for the Government, before retiring as a manager in 1984.

Now Bill has settled down at Williams Place retirement home, where the manager Nina Woodbridge enjoys his company.

“Bill is a such a warm and friendly member of our lovely community, having lived here for five years,” she told SWNS news agency.

“He’s got a great sense of humor and loves having a laugh with the team and his neighbors.

LOOK: Party-Loving Senior Celebrates 105th Birthday with a DJ and a Rave

“We’re so happy to share his special day with Bill and his brother.”

WISH THEM A HAPPY BIRTHDAY By Sharing on Social Media…