prepubescence

https://doi.org/10.1351/goldbook.11123

Period before pubescence.

Note: Whereas prepubertal refers to any time before puberty, prepubescence refers less specifically to a time closely preceding early puberty.
See also: pubescent
Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 795 [Terms] [Paper]