The governor said in a tweet that he was proud of the boy and prayed for more blessings.
“Marvin, every day, as I watch you chart your own way through life and see your countless silent victories, I am constantly reminded of how proud of you I am.
“As you celebrate another year my son, I pray that our Almighty Father in heaven continues to bless you! Happy Birthday!” he said.
On Monday, Mr Okowa’s daughter Marilyn also celebrated her birthday.
The governor said she was evolving into a “powerful” woman.