специально посмотрел
"Some studies indicate the median age gomosexual experience is from 13 to 18."
Прадвда есть "исследователь" на которого много ссылок Eli Coleman, Ph.D., assistant professor, University of Minnesota Medical School, from A Guide to Psychotherapy with Gay and Lesbian Clients который утверждает наличие стадии
I. Pre-Coming Out
Some studies have found that core gender and sex-role identities are formed by age 3, thus sexual object choice is part of gender identity. If that is true, then heterosexuality and homosexuality are determined primarily during late infancy and early childhood, and may be identified at a pre-conscious level, or even a conscious level/
"IF that is true" тут ключевое, извините.

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