How old is Megumin in KonoSuba: An Explosion on This Wonderful World?

How old is Megumin in KonoSuba: An Explosion on This Wonderful World, and how old is the explosive character in the main anime series?

Konosuba Megumin Spin-Off Anime Confirms Release

Konosuba: An Explosion on This Wonderful World!'s New Visual Gives Megumin A Familiar Look

KonoSuba: God's Blessing on This Wonderful World! Megumin: Explosion Ver. 1/7 Scale Figure: eStream - Tokyo Otaku Mode (TOM)

Konosuba: An Explosion on This Wonderful World!, Bonus Story, Vol. 2 (light novel): Deadbeat Busters (Konosuba: An Explosion on This Wonderful World! Bonus Story (light novel) #2) (Paperback)

KONOSUBA -An Explosion on This Wonderful World! English Dub Reveals Cast & Crew, Release Date [UPDATED] - Crunchyroll News

Official Trailer, Konosuba: An Explosion on This Wonderful World! – 2023

List of KonoSuba characters - Wikipedia

KONOSUBA: An Explosion on This Wonderful World! Spin-off Anime Blasts into April 2023 with New Trailer - Crunchyroll News

KonoSuba: God's Blessing on This Wonderful World! Megumin: Explosion Ver. 1/7 Scale Figure: eStream - Tokyo Otaku Mode (TOM)