"It's overwhelming," said Harries.
"I just can't believe it. I can't believe it's happening to us," said Shaw.
The folks at the Lockheed Federal Credit Union provided the cake. They even had a local artist restore an old photo of the twins taken when they were just babies. It's a big deal because 100-year-old twins are hard to find.
"The odds of identical twins living to be 100 is one in 700 million," said Andrea Carpenter of Lockheed Federal Credit Union.
That's what certain statisticians came up with. But being 100 doesn't necessarily mean the sisters act like it. They said their ever-growing family keeps them feeling young.
"I have nine granddaughters, and I have 19 great-grandkids and three great-great-grandkids," said Harries. "I keep active, try to keep active. The minute you stop, you've had it."