Additional the top loved programming languages are beyond 10 years old which means there's going to be plenty of 3yr old codebases for people to be programming in. So quite trivially it's not that the languages are too new to have old crusty codebase ...
> The TOP 15 Loved Programming Languages > Rust, TypeScript, Python, Kotlin, Go, Julia, Dart, C#, Swift, JavaScript, SQL, Shell, HTML, Scala, and Haskell.
Rust is 2015 (8 years), TS is 2012 (10 years), Python is 1991 (32 years), Kotlin is 2011 (12 years), Go is 2009 (13 years), Julia is 2012 (11 years), Dart is 2011 (11 years), C# is 2000 (23 years ago), Swift is 2014 (9 years ago), JS is 1995 (27 years), SQL is 1970?? (50 years), HTML is 1993 (30 years), Scala is 2004 (19 years), and Haskell is 1990 (33 years).
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ObjC and or Swift really should be in the Green languages column as well; what's he going to do new projects on iOS using? I think also many people would keep Java / C#|C++ in the Green column as well. SQL also would be in the green column. Moving 3 languages from Brown to Green really skews the later pie charts.