I find younger people are more likely to trust whatever they read - social media rumors, LLM output, Reddit threads - and older people looking for credible sources.
When my kid was young I set up a basic web server and taught him how to make a VERY basic web page. I let him write whatever nonsense he wanted to and then we made it live.
It was both a gateway into learning how the web works but also that literally anyone can post anything to the internet and it doesn't make it true. I like to think he's more savvy than many of his peers but we all have our blind spots.
Honestly, my experience is that it's less age specific and more like 80-90% of the general public. A lot of people just can't recognise the difference between a credible source and a dubious/fake one, and will just share any old random page or social media post they come across online. Heck, the number of people I know that see things like ChatGPT as some magic encyclopedia/sage that knows everything is depressingly high...