Stipe Miocic has decided to call it a career ... as a firefighter and paramedic in Oakwood and Valley View, Ohio. The father of two will continue working as a full-time firefighter.

Stipe Miocic is pumped after his win over Alistair ... graduate of Eastlake North going on 25 years ago — tries to defy father time and score one for the 40-somethings across the world.