https://www.cablecompare.com/blog/us-cable-subscriber-statis...
edit: oh I think you meant streaming-only. Yeah, maybe a lot higher...I don't have a good gauge on that
The only people I know under the age of 40 with "cable TV" use it pretty much exclusively to watch sports.
I wouldn't say that's comparable to ~15%.
I know lots of people who spend an immensely unhealthy amount of time in front of TVs (even me from time to time, not judging), and few of them have a cable subscription.