I think when my dad gave a speech at my great grandmother's funeral he said it best.
"The other day I looked up forever in the dictionary, it said 91 years, and though we all feel like it was not long enough life did not owe her anything"
My great grandmother lived life to the fullest, and it seems your father did too. May he rest in peace.
I know theres a big lake up theres somewhere that he is forever fishing!