I still have a PS2…

It’s like all we heard about the PS5 was that it was super hard to get when it came out and then it kind of disappeared from our collective consciousness

“meaning the other 59 million must still be using the PlayStation 4.”

That’s not what that means.

As of last December there were still 2 million active PS3 users.

https://www.playstationlifestyle.net/2023/12/26/ps3-monthly-active-users-report/

I’d imagine there’s still a limited number of PS Vita and PSTV accounts too.