新旧

1. Origins, structure, and basic meaning

• Structure: 新旧 (しんきゅう) is a noun collectively referring to new and old items or newcomers and established members.
• Basic usage: 新旧のカメラが並ぶ modifies devices from different periods, while 新旧の住民が協力する groups newcomers and established residents as collaborators.

2. Common pitfalls and similar expressions

• Object age and resident tenure
  • 新旧のカメラ contrasts production periods, whereas 新旧の住民 contrasts when people became connected to the area. It does not classify residents by biological age.