The word obsolete just means not used/maintained/cared-about/relevant any more - it says nothing about age or heritage.

Floppy discs are pretty much obsolete yet spinning hard disks, the first commercially available units of which pre-dated the first available floppy disks & drives by 15 years, are still a current tech (arguably they are on the way out, but right now they are still very much here and will be few at least a few years yet).