More Americans are hitting their 100th birthday and beyond.

According to the Centers for Disease Control, in 2014, there were 72,000 people living into their 100s, up almost 45 percent from the year 2000.

Nicole Butler met up with four women who are in their 100s and living in the same nursing home to hear their secrets to a long, healthy life.

"They always say, 'Oh, you're not that old,'" Marie Litzenberger laughs.

Litzenberger is the oldest resident at Life Spring Church Home Rehabilitation and Health Care in Fort Valley, turning 102 back in March.

"100.. It never dawned on me that I'd be that," she says.

Her secret, "It's just clean living, good, clean living," Litzenberger says.

That's exactly what geriatric doctor Jayesh Patel advised, giving me some tips to live a long healthy life.

  • Decrease the amount of stress in your life

  • Increase the amount of vegetables in your diet. He says most Americans eat too much red meat.

  • Exercise daily

Well, three other ladies over at the center are in their 100s as well -- Nora Williams, Leverne Houston, and Alice Shiftlet.

Taking Dr. Patel's advice, they do their daily arm exercises, passing around a ball.

"We didn't have junk food. We didn't know what that was," Alice Shiftlet says.

Shiftlet is celebrating turning 100, and says a lot has changed over the years, some things not for the better.

"We enjoyed life and it didn't take money, but today is different and I'm living in a different world," she says.

Shiftlet says that her birthday wish is for peace on Earth.

She says turning 100 is a blessing, and while having a healthy life is important, there's one thing you just can't live without.

"I think love is what makes the world go around. I think love is what makes a family. If you don't have love, then I don't know what you got," Shiftlet says.

Alice Shiftlet turned 100 Friday. Marie Litzenberger turned 102, and Nora Williams turned 101 back in March. Leverne Houston turns 102 in July.