Nostalgia is an odd word to use here when Guile is a Scheme, and so is part of the Lisp family.
It's the second-oldest high level programming language (after Fortran).
- Fortran: 1957
- Lisp: 1958
- ...
- C: 1972
The "family tree" analogy works imperfectly for programming languages since it is more of a directed cyclic graph than a tree structure – Fortran influenced Algol and then Algol in turn influenced Fortran.