Mortality is in all things. I suppose most people see mortality and think "My Mortality"
Sequoias and Joshua trees live 2,000 years?
Jellyfish are more or less immortal in their peculiar life cycle.
A neutron can stick around for billions of years and longer inside some of the atoms that make up matter in our universe. But when neutrons are free and floating alone outside of an atom, they start to decay into protons and other particles. Their lifetime is short, lasting only about 15 minutes.