welp, I thought I could extimate their age with this info... But I don't know for sure still...|
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The typical age groups of students for elementary, junior high school, and high school in Japan are as follows:
Elementary school for six years: (6 years old – 12 years old)
Junior high school for three years (12 – 15 years old)
High school for three years (15 – 18 years old)
So anything between 1 and 6 years. But since we know she just entered the high school I would place it between 3 and 6 years.
So he have anything between 18 and 20 and she is probably 15, it's possible she have 16 but it's unlikely