and christine ho, 85. they're old, and they're in great shape.southern california, that's not unusual. ♪ [singing] >> jane pihl swears by a healthy diet. she's never smoked, and she's been teetotal all her life. >> people are killing themselves with their eating habits. their lifestyle is killing them. >> she's a member of the seventh-day adventist church, a protestant denomination. its members believe in clean living and advocate vegetarianism. >> this health message is not a religion. it's like, they call it a right hand help, because a lot of people won't listen to religion, but they'll listen to health. >> jane pihl's late husband was a doctor. everyone in her community makes sure they drink a lot of water and exercise every day. they also believe in a day of rest. this community began in the early 20th century when adventist pioneers opened a sanatorium here. it became the loma linda university medical center. the church's healthy lifestyle seems to add years to its members' lives. the loma linda community is the core of america's "blue zone