I don't know if I need to prove it, but 18 years old or older, I don't think I need to prove it.
As for the price, you can go to Guangzhou Maternal and Infant Hospital on Renmin Road, which is safer and cheaper.
Registration fee: 7 yuan (ordinary)
Urine test: 15 yuan (check for pregnancy)
B-ultrasound: 5 1 yuan (determination of fetal position)
Abortion: about 300 yuan (including drugs needed after abortion, but this is the most common type of curettage, so I don't know how much it will cost if it is painless)