Are you daft ? How can possibly _encourage_ sane people to go fry their brain in the Youtube comment section ?
That should be a crime against humanity.
On the other hand, there are no 55-year-olds on Youtube, not in the comment section anyway.
The ones who "comment" (term used veeery loosely) on Youtube are more of the 12 to 20 section of the age pyramid, and of the age 4 to 6 bracket as far as intellect is concerned.
Absolutely no correlation to people who have already lived a good part of their lives knowing how to read and write.

You are absolutely sure it said 'prevent' the onset of dementia not 'rapidly increase up to a very young age'?
And if not, I advise the researchers to get online and read some forums and youtube comments and then hang their heads in shame and quickly put out an apology and retraction.
And I don't care who paid them how much.
And yes I'm being snide but alas - also realistic.

No! You're winding me up? Are you?
BTW, how's your boozer? Hope it not round the twist all hoity toity chuck. If so, give it some welly. Not sure if you're whinging me a groaner for a brass farthing or a tinker's damn. But anyhoo, I'm caning it. All's in favor - say "oi"; opposed? signify same by saying "aye"; abstenchees vote present by saying "ewe"... Altogether now!

Was Mike among the sample?

All those years of searching for ASCII pr0n were actually good for me!