My mom is mad I'm dating a 24yo at 18

I'm 18m and in my junior year of high school. I spend a lot of free time at the gym and I met this really beautiful girl there and we often chatted while we worked out and I eventually got her number. We've gone on multiple dates and I lost my virginity to her.

My mom eventually found out from looking through my phone and she scolded her over the phone for dating me at her age. I apologized to the girl and she wasn't too upset with me but now my mom won't shut up about her age.