Students asking your age

I’m on the younger side ( 21) and my students ask my age a lot. I work with high school. I’m very open about the college i attend and always welcome them to ask me questions about how the college is since some of them are thinking of going there. I usually try to let them know of any resources and stuff like that. BUT!! they always ask my age at the end when they find out i’ll be graduating this year. I feel weird telling them my age but I usually just go for the “ I’m in my 20s “ and it becomes a weird guessing game where I have to walk away for them to stop guessing. Any way to avoid this awkward conversation???