Yes, there does appear to be some scientific experimental evidence to support these hours.
In the longitudinal study of adolescents by Carskadon, time in bed was
fixed at 10 hours a night, and the data showed that youngsters across
the span of ages 10 to 17 slept about 9 hours and 20 minutes. The
younger children were more likely to waken spontaneously in the lab,
whereas the older children took a bit longer to fall asleep and were
rarely spontaneously awake at the end of the 10 hours.
Even though younger children and adolescents slept the same hours, the latter were less alert across the day
Furthermore, assessment with the multiple sleep latency test (MSLT, an
objective measure of sleepiness) showed that the younger children were
more alert across the day, whereas the pubertal and postpubertal
adolescents showed a midday trough of alertness in spite of the same
amount of nocturnal sleep 
and the need for sleep only diminishes in late adolescence
In summary, current data on the maturation of the biological
regulation of sleep during adolescence show that:
the circadian timing system undergoes a phase delay;
the dissipation of sleep homeostatic pressure does not change until late adolescence when it shows evidence of slowing;
the accumulation of sleep homeostastic pressure slows during puberty.
These findings support the notion that the need for sleep is stable
(or increases) acrosse adolescent development and that the delay of
sleep timing is supported by the circadian shift as well as the
slowing of sleep homeostatic pressure accumulation. 
 Carskadon MA, Orav EJ, Dement WC. Evolution of sleep and daytime sleepiness in adolescents. In: Guilleminault C, Lugaresi E, editors. Sleep/wake disorders: Natural history, epidemiology, and long-term evolution. Raven Press; New York: 1983. pp. 201–16.
 Carskadon MA, Harvey K, Duke P, Anders TF, Litt IF, Dement WC. Pubertal changes in daytime sleepiness. Sleep. 1980;2(4):453-60. PubMed PMID: 7403744.
 Carskadon MA. Sleep in adolescents: the perfect storm. Pediatr. Clin. North Am. 2011 Jun;58(3):637-47. doi: 10.1016/j.pcl.2011.03.003. PubMed PMID: 21600346.