Man's priceless reaction to finding out he is actually 98

The old saying of 'time flies when you're having fun' appears to ring true for one 98-year-old man when he thought he was just 79 years old.

The son-in-law of the 98-year-old man posted a video to YouTube showing the man guessing his real age.

"How old do you think you are?" the son-in-law asks.

The man seems to have fun guessing his age. Source: YouTube / Joe Vids

"79", the man responds.

To his shock, his son-in-law tells him "higher". "89?," the man laughs. "Higher."

The elderly man guesses every age in the 90's until he finally lands on 98 and gets it right.

"That's it, 98," the son-in-law says. "You ass!" the man says. "Holy f***! How did I get so old so fast?"

The man can't believe he is 98. Source: YouTube / Joe Vids

The pair talk about how the man is born in 1919 before he realises that "next year, I'll be 100".

"You're going to be 99 this summer," the son-in-law says. "And then next year, you're going to be 100."