Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. 'Just Too Darn Old:' Sanders, Biden Confront Age Concerns Associated Press MARSHALLTOWN, IOWA -- Bernie Sanders insists he feels better than ever less than a month after heart surgery, but his return to the campaign trail this week sparked new questions about the unusually old age of the Democratic Party's leading 2020 presidential candidates. Both Sanders, 78, and Joe Biden, 76, suggest their age isn't a major issue, but voters, particularly older voters, aren't so sure. Gordon Lundberg, a 71-year-old retired Lutheran pastor from Ames, said candidates' health is a key issue for him because he understands how it feels to age. He's leaning toward Sen. Elizabeth Warren of Massachusetts because, even though she's 70, "she's the most liberal and she's not got one foot in the grave yet." "Bernie's just too darn old. And so is Biden," Lundberg said. "They look old, they sound old, they are old. They fall in the shower, and they get heart attacks!" Lundberg is not alone. Polling has suggested that a significant number of Americans believe a candidate in his or her late 70s is too old to be president. If elected, Sanders would take office having already exceeded the average U.S. life expectancy of 78.6 years, according to data from the Centers for Disease Control and Prevention's National Center for Health Statistics. Biden would be just a few months away. While Biden, the former vice president, has often laughed off questions about his age, the issue is one that Sanders has been forced to confront more directly as he returned to Iowa this week. Sanders, a senator from Vermont, is traveling with his wife and campaign manager, whose responsibilities include ensuring that he take modest precautions not to over-exert himself, takes daily walks of at least half an hour with no phone calls and sticks to a healthier diet. .