If you want to find out how old a tree is, simply count the number of rings inside and you'll have your answer.

Well, the human ear is a lot more complex than an oak tree, but it provides valuable insight into the age of a person.

It's all about what we can - and can't - hear as we get older and the processing mechanism of our ears deteriorates.

So how accurate was this video for you?

I just turned 50 this year, and sure enough, couldn't hear anything after the first tone.