Full-grown

A full-grown African elephant weighs about four tons.

As bees in early summer swarm apace / through flowery fields, when forth from dale and dell / they lead the full-grown offspring of the race, / or with the liquid honey store each cell, / and make the teeming hive with nectarous sweets to swell. / These ease the comers of their loads, those drive / the drones afar. The busy work each plies, / and sweet with thyme and honey smells the hive.

All the immortals are full-grown; there are no children among them.

Ziri has a full-grown female tortoise.

Near-synonyms: full-fledged, full-blown, full-bore, full-on

[…] And, doubtless, unto thee is given ⁠A life that bears immortal fruit ⁠In such great offices as suit The full-grown energies of heaven.