'Charming': 102-year-old's epic bucket list trip Down Under goes viral

A 102-year-old woman has ticked off a very special item on her bucket list by travelling to Australia.

Dorothy Smith had already visited every other continent, including Antarctica in her nineties, leaving Down Under as the last destination on her list.

YouTubers Ammar Kandil and Staffan Taylor from Yes Theory, met Ms Smith while filming a video in which they spent 48 hours in the Redwoods Community in San Francisco.

They were moved by the centenarian's energy and also her regret of not having travelled to Australia and decided to help her complete the journey.

After a 14-hour flight, Ms Smith arrived in Sydney, which she called "a beautiful city".

"The people are charming, the food is good, the scenery is just wonderful and even the weather is nice," she said.

"We saw the little koala bears, of course... the lovely Bondi Beach where we got our feet a little wet and the water was really cold."

The trip also saw Ms Smith and Yes Theory cruise Sydney Harbour for an afternoon where the tourists were able to "marvel" at the Harbour Bridge and Opera House.

Ms Smith is more than twice the age of the Sydney Opera House and was born in 1922, the same year the NSW government passed the Sydney Harbour Bridge Act.

Kandil from Yes Theory called Ms Smith's story a "powerful reminder that life is meant to be lived to the fullest".

"We're incredibly happy to help her achieve this lifelong dream to visit Sydney and tick off Australia as her seventh and final continent."

The video featuring Ms Smith on Yes Theory's channel, which has more than 9 million subscribers, has already been watched 173,000 times in the first 10 hours since it was published.

For those wondering what Ms Smith's secret to a long life is? She said it came down to some simple things.

"You have to exercise, you have to eat lots of fruit and vegetables and stay hydrated," she said.

"Also, fun. You have to have fun so you'll stay healthy, and you can also enjoy 102 years.

"If there's anything else you want to try, go ahead and try it."