Watch: Meet the senior citizen 'beer pong' players replacing alcohol with tea

This weekend Auckland will host the biggest beer pong event in the southern hemisphere.

There will be 640 competitors all vying for the top prize of $10,000.

It started as an American frat house drinking game, now it's considered a sport which many people take very seriously.

However, it's not just youngsters taking part, with Kiwis aged in their 70s to 90s meeting twice a week to play at an Auckland's Selwyn Centre.

Seven Sharp's Carolyn Robinson went for a look as they played a more grown up version of "tea pong".

For the full story, watch the video above.