the immune system is powerless to stop aging it produces fewer natural killer cells these help defend us against viral bacterial and fungal infection. they can even recognize and destroy. the fewer killer cells we have the greater the risk lawful sick. auto immune disorders can also occur as we get older. this means our new systems can mistakenly attack and destroy healthy body tissues this can be to remove toit arthritis for example. so there we have it. oh and by the way the brain ages differently. most neurons the core component of the brain can't reproduce so damage through sound division doesn't occur but biochemical