What does it mean that information expiration?

Set expiration dates on time-sensitive information so it does not clutter your system.

Example: You saved a competitor pricing analysis six months ago. At the time it informed a real decision — whether to adjust your own pricing for Q3. The decision was made. Q3 ended. The competitor has since changed their pricing twice. But the analysis is still in your notes, still appearing in searches, still sitting alongside current material as if it were equally valid. When you prepare for a new pricing discussion in Q4, you open your notes and find three pricing-related items: the stale competitor analysis from six months ago, a current market report from last week, and your own pricing principles note (which is timeless). Without expiration metadata, all three look identical in your system — just notes about pricing. You read the old analysis, half-remember that it was once important, and spend eight minutes re-establishing that it is now outdated before discarding it mentally and moving to the current report. Multiply this by every stale item in your system. Across hundreds of stored items with no expiration marker, you are spending hours per month re-evaluating information you have already determined is time-bound, rediscovering that it has expired, and then ignoring it again. An expiration date set at the moment of capture — "valid through Q3 2025" — would have flagged the analysis for archival or deletion automatically. You would never have re-encountered it. Your search results would have been cleaner. Your Q4 preparation would have started with the two items that actually mattered.

Try this: Open your primary note-taking or knowledge management system. Select twenty recent items — notes, bookmarks, saved articles, clipped references — captured in the last three months. For each item, assign it to one of four expiration categories: (1) Expires within one week — time-bound to a specific event, meeting, or decision window. (2) Expires within one to six months — relevant to a current project or season but not permanently. (3) Expires within one to five years — valid for the foreseeable future but tied to conditions that will eventually change. (4) No expiration — principles, frameworks, mental models, or truths that have held for decades and are likely to hold for decades more. For every item in categories 1 through 3, add an explicit expiration date to the note metadata, filename, or first line. Use whatever format your system supports — a tag like "expires:2026-06-01," a metadata field, or a simple line at the top of the note. For category 4 items, add a marker like "evergreen" or "no-expiry." Then set a calendar reminder for one month from today labeled "Expiration Sweep." When that reminder fires, review all items whose expiration date has passed. Archive or delete each one. Track how many expired items you remove and how much cleaner your active system feels afterward. Repeat the sweep monthly.