Man tests girlfriend with excruciating riddle. Can you figure out his ‘simple’ math question?

In this viral video, the man leaves his girlfriend baffled by asking her a tricky math riddle. See if you can solve it!

During a bedtime chat, YouTuber xmintyx asks his girlfriend:

“Two brothers, one of them is 4 years old and the other is half his brother’s age. How old will the younger brother be when his older brother is 100?”

“Fifty,” his girlfriend answered.

The question is quite straightforward, but she got it wrong.

Can you work it out? Tip: Do not focus on the words “half the age”; rather, take note of the younger brother’s actual age.

Watch the video to find out.

Video credit: JukinVideo