You may be an older person, but for anyone with teens an interesting aspect is that they hardly use it.

FB is turning into a "how to talk to grandma" network.

Isn't that what it's supposed to be? Facebook has the market of young people captured pretty broadly with Instagram. I doubt they would appeal so much to older people if they focused in appealing to younger people.

Yep, and if I remember right, that was the same pattern that the prior dominant social platforms saw before they collapsed.

In the US, sure, but globally they are still growing in almost every demographic.

Facebook growth numbers haven't been strong lately, but it's still growing [0]. With 2.3B monthly active users 15M isn't much to worry about unless a specifically profitable sub-population is doing the leaving.

[0] https://www.statista.com/statistics/264810/number-of-monthly...

If it is 15M US users, that's 4.5% of the US population.

In the country with the highest value per user to advertisers, yes i'd say this is a huge deal.