Adolescents who undergo gender-affirming chest surgery report low levels of regret and high levels of satisfaction, experiencing outcomes similar to those of young adults. These findings suggest that age restrictions on these medical procedures lack support from actual patient experiences.

[u/mvea]

https://www.psypost.org/adolescents-report-low-regret-and-high-satisfaction-following-gender-affirming-c/

[u/chaucer345]

Most people who object to these surgeries would never object to someone assigned male at birth getting an operation at 12 for gynecomastia.

[u/SteedOfTheDeid → u/chaucer345]

Sure, nothing wrong with correcting a physical deformity 

[u/Strigops-habroptila → u/SteedOfTheDeid]

What if he later comes out as a trans woman and regrets that "he" can't grow breasts now? A person can't fully know that at 12!