1, different meanings: "Sister Chen" is usually a respectful name and kind address for younger women surnamed Chen, and sometimes it can also be used to express intimacy and affection. "Lao Chen" is a respectful name for the old man surnamed Chen, and sometimes it can also be used to show respect and trust.
2. Different ages: In social occasions, women of similar age can call each other "Sister Chen", which is both respectful and cordial. In the workplace, young employees can address their older colleague or boss surnamed Chen as "Lao Chen" to show respect and respect.