[chias]

In most cases, yes, but I don't think it implies stagnation. With the exception of the CSS ones which have been obsoleted by modern flexbox, those questions are mostly basic enough to defy change:

php: check if an array has duplicates

Java: what's the big-O time of declaring an array of size n?

SQL: what exactly do Primary Keys and Indexes do?

[dleeftink]

I agree, plateauing may be more apt in this case. I wonder to what extent exemplary questions like these remain universal, or have an expiry date that just isn't known at this time.