The life expectancy of a motorcyclist depends greatly on whether or not they wear a helmet and what their driving habits are. That said, the most common age of people who died in motorcycle accidents in 2020 was 30. Thirty-year-old motorcyclists accounted for 3 percent of all motorcycle fatalities that year, according to data from the National Highway Traffic Safety Administration. The data also showed that the plurality of deaths, 15 percent, occurred among people between the ages of 25 to 34.