Humans have the highest natural lifespan of only 38 years, according to a new technique developed for evaluating the lifespans of different species by examining their DNA. Through the genetic comparisons of species with known lifespans, researchers have found that the lost woolly mammoth probably lived around 60 years and bowhead whales can assume to enjoy more than two and a half centuries of survival. The new research proves how DNA changes as an animal ages and observed that it changes from species to species and is associated with how long the animal is expected to live.