mixedmedia

It depends. If it is a one time thing, I don't think there is much difference. If it is an ongoing thing where the older partner is exploiting vulnerabilities in the younger partner to control or manipulate them emotionally, that's where the greater chance of long-term damage lies. In my estimation, anyway.

And you could also look at it this way - what is potentially more damaging to a young person? A one night stand with an adult? Or an ongoing emotionally abusive relationship with someone their own age?

Most psychologists believe we are remiss to assume that the damage in cases of sexual abuse comes primarily from the sexual acts themselves. Certainly trauma can be associated with sex as a result but, the real lasting emotional damage stems from the abuse of power and loss of trust.

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Most people go through life dreading they'll have a traumatic experience. Freaks were born with their trauma. They've already passed their test in life. They're aristocrats. - Diane Arbus
PESSIMISM, n. A philosophy forced upon the convictions of the observer by the disheartening prevalence of the optimist with his scarecrow hope and his unsightly smile. - Ambrose Bierce