Old is relative. There is a good core dev community and recent development is promising. It's interesting you mention Lua because that is a language I picked up

Old is relative. There is a good core dev community and recent development is promising. It's interesting you mention Lua because that is a language I picked up when looking to move from Tcl at some point in the last 8 years. I decided rather quickly against that. The reason is the swig bindings for Tcl are sufficient to generate decent package cores for just about anything I care to extend and I can optimize later.