A key to a YouTube's channel success is how much "evergreen" content it has -- content that doesn't date (very much or at all) and can be viewed after 1 year or 5-10+ years.  The more of such videos your channel has, the more views they continue to get, and the more passive income you continue to earn over the lifetime of such videos.

Sadly, tech-related videos generally have short shelf-life due to the ever-changing nature of tech.  But some tech subjects can be evergreen.  Historical topics can stay relevant well into the future because the past doesn't change.  Certain concepts don't change (that much) over time, such as the design principles of databases (indices, normalization, referential integrity, 1NF, 2NF, etc.).

All those news and current event channels date the fastest, for obvious reasons.  A typical news story may last a few days or weeks at most.

I watch a lot of movie-related channels, which can be evergreen if the creator inject as little "of-the-moment" info as possible.

Old SNL clips often date very easily, because their jokes are often topical -- and the news story that inspired them long forgotten.  For instance, the jokes about "Dan Quayle and potatoes" and Bill Clinton's "didn't inhale" comment were well-known at the time, but probably not so much to today's generations.