6
- VTech Laser 200
- Do you count MBasic REPL? (If not, it was Borland Sidekick)
- PRINT 10
- ~5 years (if LOGO is counted)
- LOGO
- Emacs
- Common Lisp (but it can be Python, JS, Golang, or Clojure if you want to hire me.)
- Common Lisp
Lisp (historically LISP) is a family of programming languages with a long history and a distinctive, fully parenthesized prefix notation. Originally specified in 1958, Lisp is the second-oldest high-level programming language. Only Fortran is older, by one year.