YONGIN, South Korea — One of South Korea’s hottest YouTube stars is a 70-year-old grandmother whose cool, undaunted style and hilarity are a breath of fresh air in a social media universe that exalts youth and perfect looks.

Park Makrye’s videos are all about showing off her wrinkles and her elderly life in the raw. Young South Koreans find her so funny and adorable that big companies like Samsung Electronics and Lotte are banking on her popularity.

Despite her new life as a celebrity, she still gets up before dawn to run her diner.

Serving kimchi while clad in a dotted pink top and short skirt with a kitchen hygiene hat on her head, Park isn’t exactly the most stylish beauty icon.

Yet, South Koreans love watching her give make-up tutorials, reunite with an old friend or try pasta for the first time in her life in her “Grandma’s Diary” YouTube videos.

“She’s real. She’s not fake,” said Lee Injae, a 31-year-old living in Seoul. “It’s refreshing to see the world through the eyes of a grandmother.”

Before YouTube, Park says, her life was “dead like rotten bean sprouts.”

“We used to think, ‘Since I’m over 70, my life is over,’ ” Park said in an interview, sitting in the living room that she turns into her YouTube studio by taping a broad piece of paper on the wall.

“But as I started doing this, I realized life starts at 71 years old,” she said, adding an extra year as is the custom in Korea and many other Asian countries.

Encouraged by a granddaughter to start making videos as a way to stave off dementia, Park is living it up. She’s posed for a women’s monthly magazine spread, hosted a home shopping show for retail giant Lotte and will be appearing next week as a model in a YouTube commercial for Samsung’s TV.