Robert Blake (b. 1933) has been a Youtuber for the past 3 years. The videos in the web series are titled "I ain't dead yet, so stay tuned". The most recent video is from 15 December and only has the following scrolling text: https://www.youtube.com/watch?v=-7YhBChE-fY
"Hi gang,
This is the old cowboy himself talking to you. I've been preoccupied with being old. In other words, trips to the doctors, trips to the hospital and this and that. But God handed the ball back to me and I'm OK. And I give thanks that I'm OK in time to give you a little holiday treat."
Then Blake plugs his autobiography and writes "if I was there, I'd give you a big kiss on the mouth, boy, girl, or anything in-between".
Ummm, alrighty then...
He closes out thes message with "That's it for now, unless the big boss calls me to his table for all the holidays to come".
While we don't know the cause for his hospitalization, and he seems to be stable for now, you can never rule out recurrence of ailment at age 88. The video preceding this one was in August, so this issue must have gone on for a few months.