Curmudgeoning skills can be learned online — just follow any major news story about any new-fangled device/idea and it will provide the right level of intolerance and grumpiness.
But to really excel and build your curmudgeon profile, you need to attend a course.
Curmudgeon 101 is an entry level course of study that will get you started with the basics, focusing on bloody-minded sheer grumpiness as a first step towards the more advanced fluent curmudgeon.
This requires the abandonment of any form of sophisticated thinking and complete deafness to anyone else's ideas.
There is no age restriction but the course is very popular with males aged over 60 (an 18-year-old signed up by mistake thinking curmudgeon was a foreign language).
The only course requirement is an ability to be at odds with the world about nearly everything and to say so loudly with a completely indestructible sense of entitlement.
The Curmudgeon 101 course is divided into modules.