I agree with you; the age of consent is not just about power disparities, but also about how malleable is the mind at young age and how early experiences can affect a child's sexuality and personality growing up; Given that relationships even between adults can be toxic or abusive; the point of the age of consent in this case would be to make sure the emotional and intellectual maturity of the individuals in a sexual relationship would be enough not to leave scarring sequels for the developing child.