Why do many companies have an age limit (usually 18-28) for recruiting e-commerce specialists or assistants and even for customer service and design?

Age 18-28 is more energetic and capable.

From the procedural point of view, recruitment usually consists of formulating employment standards and numbers, information release, communication, assessment, comparative selection, trial and employment. Employers make recruitment plans and recruit employees in a certain way. As a marginal humanities subject, recruitment can be divided into political recruitment, military recruitment, economic recruitment and cultural recruitment.

According to the main body, it can be divided into government recruitment, enterprise recruitment and individual recruitment; According to the implementation mode of recruitment, it can be divided into independent recruitment and entrusted recruitment; According to the candidates, it can be divided into boss recruitment and employee recruitment. Boss recruitment is the mainstream recruitment and employee recruitment is the non-mainstream recruitment.

In July, 2009, an engineer in Shanghai, China wrote on his belly that he wanted a boss. Although its successful operation and ending filled the blank of the dual-track system of "recruitment market", relaxed the psychology of migrant workers, attracted the attention of the media and aroused strong repercussions in society, it still belongs to the non-mainstream mode and belongs to a special case.