If you run a personal website and notice pages or posts that haven't been touched in years, the first question is usually whether they still serve the reason you started the site. A useful starting point is to look at each old piece and ask whether it still represents something you want visitors to find. If a page describes a project you finished, a tool you no longer use, or an opinion you've moved past, keeping it without any note can confuse someone who stumbles on it and assumes it reflects your current work or views.
One practical approach is to add a brief note at the top of the page stating when it was written and whether the information still applies. This takes very little effort and gives readers the context they need to judge the content for themselves. You don't have to rewrite the whole piece; a single sentence like "written in 2019, some details may be outdated" is often enough. This way you preserve the record without letting stale information speak for you silently.
If a page no longer fits the site's purpose at all, removing it is a reasonable option. Before deleting, consider whether anything else links to that page, either from your own site or from places you can easily check. If links exist, you might redirect the old address to a relevant current page or a simple note explaining the content is no longer available. This avoids leaving visitors with a broken link and no explanation.
You don't have to handle every old page in one sitting. Picking a small batch, applying one of these approaches, and seeing how it feels is a workable way to make progress without turning it into a large project. Over time, you'll likely develop a personal rule for what stays, what gets a date stamp, and what goes, and that rule can guide future decisions without requiring a full audit each time.