Adults who give proxy consent for medical treatment for adolescents mu
st decide how much weight to give to adolescents' own preferences. The
re is evidence that some adolescents choose treatments different from
what adults see as most reasonable. It is argued that adolescents choo
se according to age-specific values, i.e. values they hold, as adolesc
ents, and which fulfil important developmental needs. Because not fulf
illing these needs may do serious psychological damage, it is urged th
at proxies give weight to these values, up to the limit where it would
endanger or profoundly limit future life.