My most recent have been the new low-cost LEDs. I only bought my first batch about six months ago. I have been replacing CFLs as they fail, so only have four LED bulbs in service at the moment - ranging from about a week to 6 months in service.
The oldest in-service has been on continuously for the full 6 months. (It's the "basement night-light" on a ceiling mount that doesn't have an off switch. It's a 6-watt LED / "40 Watt equivalent".)
My earliest batches of compact fluorescent bulbs were terrible. The newer (2005+) batches are just starting to fail.