[3][4] Okunbor began playing Gaelic football at the age of 7.
[5] He played for Kerry in the 2016 All-Ireland Minor Football Championship; he was later signed to Geelong Football Club for a two-year contract in 2018.
[6][7] In 2021, his contract with Geelong ended; as a result, he returned to Ireland to play for Kerry.
[8] Stefan was born in Moldova to a Nigerian father and Moldovan mother;[9][10] he moved to Tralee at the age of three.
He is currently studying bioengineering at the University of Limerick.