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Most of the university alumni were in the younger age groups, while in the oldest age group many people did not have any qualifications.

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The first part is OK, but the use of while makes the reader then expect some form of a contrast. eg Most of the university alumni were in the younger age groups while only a few people were in the older groups. In addition, I don't understand why the oldest people did not have any qualifications. As alumni, didn't they have degrees? And why are the qualifications of the younger people not mentioned? All in all, this is not a well-structured sentence. Clive
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Is it possible that you were describing a group of people in which the younger people had a university education and the older people did not?

You need to make the two parts of your sentence parallel.

The younger members of the group were university graduates while the older ones had little education.

You can use 'alumni' if you want, but it's not really necessary in your sentence.

CJ

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Comments  
aspire12345678

Most of the university alumni were in the younger age groups, while in the oldest age group many people did not have any qualifications.

I'm thinking not. You use "alumni" when their affiliation is pertinent. I'd be willing to bet you mean "graduates":

"Most of the university graduates were in the younger age groups, while in the oldest age group many people did not have any qualifications."

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