Use of Fortran is very specific. For example, I know that it is fairly used in nuclear industry because it's rapid development began when fotran was the most popular scientific lang. A lot of fundamental libraries for nuclear engineering were written in it.
However times change and these are slowly being ported to more modern langs.
If you are interested in it as a hobby tho, then there are still some who share the passion, but it is better to seek company on more specialized forums. It is quite a specific hobby, after all.