1) Immature 2) Prepubertal 1) Prepubertal 
<paediatrics> Immediately prior to the commencement of puberty. ... (05 Mar 2000) ... 
(pre″pu-bes´әnt) prepubertal.
Type: Term Pronunciation: prē′pyū-bes′ĕnt Definitions: 1. Immediately before commencement of puberty.
[adj] - (especially of human beings) at the age immediately before puberty
prepubescent (pree' pyoo BES uhns), pre-pubescent 1. At or characteristic of the stage of life just before puberty. 2. A child at the stage of development just before puberty. 3. Relating to or in the period preceding puberty. 4. A reference to the period before children start to develop adult sexual characteristics.
prepubertal adjective (especially of human beings) at the age immediately before puberty; often marked by accelerated growth
of or pertaining to the years immediately preceding puberty, prepubertal.