This is especially true where the answer is time-bound, which happens a lot in technical topics. Many times the snippet is for an earlier version of the language (but still with a high PageRank), or the Operating System (especially Android settings), and the most annoying at all: an ancient answer in an undated blog post.
Google is good at dating undated content. They keep track of the first time they've ever seen a bit of text, and assume it was composed then, even if it later gets copied to other sites.
