That’s a smart one

To be fair English has a lot of German. The “teen” sound almost certainly comes from the sound “zehn”. It’s pretty easy to hear how fünfzehn und sechszehn eventually become fifteen and sixteen. We’re more or less saying five ten just kinda mushed together.

I haven’t been geocaching in forever. I used to go all the time, but I saw you post about it in another place and figured I’d join and maybe try to pick up the hobby again