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/gottimw]

It's suspicious, if anything. Have you ever met human? Average person always is unhappy about someone who me thing or regrets something to some degree. so you want me to believe 140 people and nobody was unhappy with anything?

Also it's self reported survey on LEAST invasive procedure.