This is not just a division of age. If someone is called "Xiao" just because he is younger than you, adding the word "Xiao" before the surname seems friendly, but it is not, and the business behind him will also be affected. The following are some points that should be paid attention to when addressing customers, hoping to help you.
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Stranger's name:
Customers who meet for the first time are generally satisfied. There are several types:
1) For customers with positions, address each other as "surname+position". Generally speaking, the appellation should be "high or low" and "flexible".
2) For customers with social status, use their professional titles. For example, Dr. Liu, expert Zhao and Academician Lu.
3) For customers who don't know the background, they can also be called "surname+Mr." or "surname+Ms.". However, because Mr. is a bit formal in domestic culture, it can be changed to other names in informal situations, which is more cordial. Such as "teacher" and "elder".
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4) For older customers, men can use "surname+old" to show respect; Women can use the names of "big sister" and "aunt". The age of women must be well grasped. Lao Li's principle is that even if the customer is 20 years older than you, if the female customer is under 60 years old, it is best not to be called "aunt".
5) For professional customers, it can be directly called "surname+occupation". For example: police officer Wang, staff officer Hu, lawyer Zhao and so on.
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Because the address of strangers is often more formal, generally speaking, when strangers become frequent visitors or informal occasions, the address will change and become more intimate and casual. For example, if you meet a male customer younger than yourself, you can call him "brother", "buddy" or the last two words of the three-word name. The scenes of regular customers are diverse, so I won't go into details here.