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It depends on what is taken into consideration when making the calculations.
"Abortions in relation to age, coital frequency, and fecundity:Abstract.......This article addresses the question of age variations in abortions. ……. the abortion rate is highly related to age; except for the youngest age group, ….Younger women have much higher age-and-coitus-specific abortion rates than older women when coital frequency is considered. ….…..When an adjustment for coital frequency and fecundity is combined, the differences between the age classes change considerably. Among all women, i.e., non-married and marrieds, teenagers have a very high abortion rate, while other women differ much less"…….
https://pubmed.ncbi.nlm.nih.gov/3800641/
And you are right useful, honest intelligent sex ed should start long before the teen years. Unfortunately the same states that restrict sex-ed to abstinence only also restrict access to clinics that provide women's controlled contraceptives and family planning counseling. Many are in the process of calling most women's contraceptives abortifacients.
I grew up in a suburb of NYC. My parents were permanently reluctant to talk about sex. I was told that children were born only after marriage. Puzzled, I asked if birds got married and was told firmly "Yes". I remember thinking that was a very silly answer.