Overheard in the Sauna, part 2

I, my father, and our Teemu (9) had a sauna the day before yesterday. Our conversations ranged from hunting to birthdays.

My father: Teemu, do you know how old Vaari [my dad's father] would be today if he was still alive?

Teemu: No. How old would he be?

My father: 89. Who is going to bake a cake for him in heaven?

Teemu: God of course [Jumala tietenkin].