[csdvrx]

> If you need 20 year old code to run on new machines, the same thing occurs - you hand it to a recent Perl 5 and it works.

You're only noticing half of the picture.

If you want to write code that'll still run in 20 years, do the same.

[cestith]

Are you saying that in 20 years they'll have removed all the features added in the last 20 years?