Discourseは、誰かが特定の年に投稿しなかったが、別の日に投稿したと主張しています

[JammyDodger]

It has cropped up a couple of times, and I think you’re right, it does make sense to ‘retire’ them after a useful window.

Edit: ux topic Removing Welcome and Returning User notes from posts after a set time