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.

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This group of Auckland residents play the US frat house favourite twice a week. Source: Seven Sharp

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.