Maybe but would need to know more. Motorcycles have been mass produced for 130 years nearly. The term classic can range from anything 20 years old to 35 years old and older. Kind of depends on who you're talking to for the definition of classic. This means that looking for people who like classic motorcycles fit an enormously broad range of motorcycles and evolution over time.

Through much of the motorcycles history they fit kind of very similar styles. Until they started to deviate and the late '70s and '80s. Now you can have motorcycles that are classics in the terms of age but they are full on crotch rockets.

I suspect one community would not fit the entire range of classic. Especially if you're looking for like-minded people with similar styles of motorcycles.