WATCH: Ryan Reynolds helps 84 Year old woman celebrate her 21st Birthday!

She may have been born in 1936, but Arlene Manko just turned 21 - thanks to her birthday being on February 29.

Ryan Reynolds was keen to help Manko celebrate her leap year birthday with her first "legal" drink.

In the hilarious and adorable video, the 84-year-old is seen relaxing in an armchair and showing off photos, explaining she was "technically five-years-old when I got married". 

The whole video is a campaign for Aviation Gin but is done in such a way that you don't even care that you're watching an ad! 

"We wanted her first legal drink to be Aviation Gin," says Reynolds, who does the ad's voiceover.

Manko appears to enjoy it, exclaiming "holy Moses!" before admitting she didn't know who Reynolds was.

"Ignore her," he says, chuckling. "She's been drinking."