Esperanto is still a made up language though. You could say languages with a native speaker population or something, but Esperanto is still a made up language. Made up language ≠ not spoken language. It is a widely spoken conlang.
Native Esperanto speakers (Esperanto: denaskuloj or denaskaj esperantistoj) are people who have acquired Esperanto as one of their native languages. As of 1996, there were 350 or so attested cases of families with native Esperanto speakers.
Native Esperanto speakers (Esperanto: denaskuloj or denaskaj esperantistoj) are people who have acquired Esperanto as one of their native languages. As of 1996, there were 350 or so attested cases of families with native Esperanto speakers.