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 Did Humans Evolve From Apes? Why Are The Bees Dying? Why Do Dogs Smell Each Other’s Butt? 9 Weird Ways Animals Communicate How Do Chameleons Change Color?