Home > Plants & Animals > Why Do Animals Have Such Different Lifespans? Why Do Animals Have Such Different Lifespans? Plants & Animals Share on Pinterest Elegans, a microscopic worm lives for just a few short weeks. But the bowhead whale can live to be two hundred years old. Why do these lifespans vary so much? And why do animals grown old anyway? Share on Pinterest Related Posts How Do Chameleons Change Color? See How Mosquitoes Use Six Needles To Suck Your Blood Nature’s Most Amazing Animal Superpowers Did Humans Evolve From Apes? Why Are The Bees Dying?