This is possibly a stupid comment, but I'd love a modern language whose expected lifetime is 100 years. A language whose specification details how it can be run

This is possibly a stupid comment, but I'd love a modern language whose expected lifetime is 100 years. A language whose specification details how it can be run for 100 years on changing hardware + operating systems, and is built with the least amount of, and easiest to perform, maintenance in mind. Those languages kind of exist, but not expressly written as such. C will outlive us all.