Screen time restrictions on adult phone

Years ago when I got my iPhone 13 my mom set my age really low well below my actually age. Now I’m 18 and moved out but the phone age is still set to 9 years old and I cannot access my account settings, or download apps, or change any screen time settings because it’s all protected by her old screen time passcode. The account manager (my mom) has no wish to help me remove it so I’m stuck with all these restrictions and I need a way to update my age and leave the family sharing so that I can actually have control of my phone now. Can Apple help me solve this or change my age for me if I prove my identity?