Final answer:
Individuals typically become aware of their sexual orientation between middle childhood and early adolescence, and for Ethan, he likely began feeling different from his heterosexual peers during this period.
Step-by-step explanation:
Most individuals, including those who identify as gay, lesbian, or bisexual, usually become aware of their sexual orientation between middle childhood and early adolescence. For someone like Ethan, who is nineteen years old and identifies as gay, it is likely that he began feeling different from his heterosexual peers during childhood or early adolescence. This period in life corresponds to the ages before high school, typically ranging from nine or ten years old, aligning with the onset of puberty for many. Recognition of one's sexual orientation doesn't require engagement in sexual activity, as it is often perceived through emotional, romantic, and physical attractions. Additionally, societal pressures and historical norms can influence how and when individuals choose to disclose their sexual orientation.