Depends on what you mean by "100-year language". If it's in the pg sense (i.e. a language that's on the main branch of the evolutionary path of programming lang

Depends on what you mean by "100-year language". If it's in the pg sense (i.e. a language that's on the main branch of the evolutionary path of programming languages) I think the answer is clearly the ML family. If you mean "what language is most likely to be around in 2100 AD", realistically we'll have C for as long as we'll have computers.