You can consult virtually anyone who's gone through normal gender transition processes under government care or insurance care, or examine the process documentation yourself. It simply does not happen through normal processes unless the rules are broken. There are long waiting lists and safeguards, the standards of care don't approve of this.
If it happens, it's people breaking the rules and possible medical malpractice - both of which can happen in all areas of care.
You can't simply dismiss reality based on one or two outliers. For example, if you look at the typically used standards of care https://www.wpath.org/publications/soc :
* Criteria for surgery
a. Gender incongruence is marked and sustained;
b. Meets diagnostic criteria for gender incongruence prior
to gender-affirming surgical intervention in regions
where a diagnosis is necessary to access health care;
c. Demonstrates capacity to consent for the specific
gender-affirming surgical intervention;
d. Understands the effect of gender-affirming surgical
intervention on reproduction and they have
explored reproductive options;
e. Other possible causes of apparent gender incongruence have been identified and excluded;
f. Mental health and physical conditions that could
negatively impact the outcome of gender-affirming
surgical intervention have been assessed, with risks
and benefits have been discussed;
g. Stable on their gender affirming hormonal treat-
ment regime (which may include at least 6 months
of hormone treatment or a longer period if
required to achieve the desired surgical result,
unless hormone therapy is either not desired or
is medically contraindicated).*
This simply does not support any claims that teenagers are easily getting surgeries, if at all. Any doctor following these standards of care would not approve it. People breaking the rules to approve it is tragic, but generalizing based on this is unhelpful because it distracts from the real problems.