going to church playing bridge doing everything. reporter: she crediting at least some of her longevity to a lone-star-state favorite. you re drinking dr. pepper right now. that s exactly right. this stuff is good. it s got sugar in it. and two doctors have told me that if i drink it i will die, but they died first. reporter: that s proof that it s good for you? yeah. reporter: you think that this drink has helped you live to this age of 104? well evidently, because everybody tells me it has too much sugar in it. but since i ve been drinking three a day for 50 or 60 year the, evidently my body needs sugar. i don t take any medication. they can t still find anything wrong with me. reporter: elizabeth says other than giving birth and getting her tonsils out, she s never been a hospital patient, even at 104, elizabeth has managed to maintain her
an exclusive club. the other day elizabeth sullivan turned 104 years old. there have been 18 u.s. presidents during her lifetime starting with taft. gary tuchman met her today. take a look. reporter: elizabeth sullivan has lived in the same ft. worth, texas, house since 1942. i m glad for you to come in. reporter: she has just celebrated her 104th birthday. as the big balloons in her living room made clear. you had your driver s license until last january? you were 103? i was driving everywhere. you were? i was going to church i was going to the woman s club i was playing bridge. i was doing everything. reporter: she credits at least some of her longevity to a lone star state favorite. you re drinking dr. pepper right now.