According to Kunio-kun Fandom, Misako’s student ID card revealed that she is an 18 year old girl in senior high school.
There is no official data about the height of Misako. Her height was only estimated by observing the difference between her height and Kunio’s. Kunio is the boyfriend of Misako and we looked at some pictures of them together. Most of the time, Misako is shown to be around 4 to 5 inches shorter than Kunio.
According to Characters Fandom, Kunio’s height is 175 cm (5’7), this means that Misako should be around the height of 5’2.