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pre-adult
pre-adult adj. 
/ˌpriːəˈdʌlt/, /ˌpriˈæˌdəlt/ occurring prior to the attainment of adulthood; not yet adult.
Brit. /(ˌ)priːˈadʌlt/
, /(ˌ)priːˈadʌlt//ˌpriːəˈdʌlt/U.S. /ˌpriəˈdəlt/
, /ˌpriəˈdəlt//ˌpriˈæˌdəlt/ΘΚΠ
the world > people > person > young person > [adjective] > adolescent
adolescent1481
undergrown1601
pubescent1646
halfling1801
halflang1805
teenish1811
halfling1815
teening1818
puberala1856
puberate1880
pre-adult1899
teenage1912
teenaged1913
1899 Science 21 July 80/2 The report contains an extended account of the eggs and pre-adult stages of these insects.
1902 A. H. Buck Ref. Handbk. Med. Sci. (rev. ed.) IV. 527/2 The condition..becomes manifest during the growing or preadult period.
1974 Sci. Amer. Sept. 127/3 A husband, a wife and their preadult children.
2000 A. Calcutt Brit Cult 68/2 These two sides of Blair are both based on new ideas of the electorate as pre-adult cultural consumers.
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as lemmas