Fully developed
Old and fully developed are semantically related. In some cases you can replace term "Old" with "Fully developed", this terms are similar.
Old
Old adjective - Being of advanced years and especially past middle age.
Fully developed and old are semantically related. Sometimes you can replace phrase "Fully developed" with "Old", this terms are similar.
Both terms in one sentence
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Despite the fact that he's a very overweight 11-year-old with fully developed teeth (which Pete found out the hard way), and that PJ "mysteriously vanished" until Max came up with the excuse several minutes later that he was at the store, Pete doesn't realize that the baby is PJ.
Source: Western Animation / Goof Troop - A columnist◊ for the Swedish tabloid Aftonbladet described Sailor Moon as a nine-year-old in a "fully developed adult body" who was dressed "in a skirt so short you see her panties all the time" and passive-aggressively reflected on how no one questioned the "horny pedophile's wet dream".
Cite this Source
Old and Fully developed. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/fully_developed/old
Fully developed & Old. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/fully_developed/old>.
Old or Fully developed. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/fully_developed/old.
Google Ngram Viewer shows how "fully developed" and "old" have occurred on timeline