They found that the maximum reported age of death — the age of the oldest person to die in a given year — in France, Japan, the United States and the United Kingdom (the countries with the largest numbers of supercentenarians) increased rapidly between the 1970s and early 1990s but plateaued in the mid-1990s at 114.9 years. (scientificamerican.com)
With luck, they might make it to 160 - 175 years old (the age of giant tortoise) because they may have found supercentenarians who supposedly beat Jeanne Calment's 122 years and 164 days MLSP standard. (fightaging.org)
Few supercentenarians eat high - carb diets, so carbs may indeed reduce maximum lifespan, though eating a high - carb diet certainly doesn't prevent people from becoming centenarians. (perfecthealthdiet.com)