20 Once Again
重返20岁 (original)
A visit to the photographer’s returns the physical looks of a 70-year-old grandmother back to her 20s. Things get even stranger when his grandson asks her to join his band, and his best friend begins to fall for her.
Starring Yang Zishan, Gua Ah-leh, Chen Bolin, Lu Han, Deshun Wang, Wang Qing, Hao Xuankai
It's a comedy and fantasy movie, and has a rating of 6.5 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Sweden.