Apparently Millennials are the only people who know how to use Excel anymore

We have a 20 something in our office who was trying to put together a spreadsheet and I see them struggling to add numbers up on their phone. I inquire“Why don’t you just use a SUM function for that?” - full dear in headlights moment. I show her “SUM equals *click*click* there…” Mind blown, never heard of formulas, did not know such functionality existed. I’m apparently office hero now. Growing up, I was always used to helping the older folks with spreadsheets, that was a given, but someone younger than me?! Like I was self-learning pivot tables and Visual Basic in my 20s, not flailing through with a phone. Is creating a spreadsheet becoming a lost art and it’s up to us to carry on the number crunching legacy? Anyway, just interesting observation. Can anyone relate?