[Someone]

> SVT's "Text-TV" is to my knowledge still the worlds oldest, operational service of its kind.

https://en.wikipedia.org/wiki/List_of_teletext_services says “The Netherlands has run a regular Teletext service since the end of 1977 on the public broadcasting channels”. That would make that older. Ceefax was from 1974, so it seems there’s room for an even older still operating one.

[hnarn]

Ceefax was shut down in 2012.[1] I have no idea about the Dutch one, it's possible that it's older.

edit: According to this site[2] the Dutch teletext was broadcast "on the open network" on April 1, 1980. There's also a Swedish source claiming that Swedish Text-TV is the oldest in the world.[3]

[1]: https://www.bbc.com/news/uk-20032882

[2]: https://over-nos-nl.translate.goog/organisatie/geschiedenis-...

[3]: https://sverigesradio.se/avsnitt/1216116 "idag har faktiskt Sverige världens äldsta ännu aktiva Text-TV"