Format Online paper / PDF
Location PART 2 - FOUR HIDDEN CHIMNEYS CHAPTER 10: BUILDING-BLOCK REALITY Blocks Tend to Stick Around

"In 2025, GAO identified 11 critical federal legacy IT systems in need of modernization that were approximately 23 to 60 years old."

GAO's inventory provides a concrete example of decades-old software systems remaining operational and mission-critical long after newer technologies have appeared.

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Source title Information Technology: Agencies Need to Plan for Modernizing Critical Decades-Old Legacy Systems
Source authors U.S. Government Accountability Office
Source year 2025
Confidence high
Importance high
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