I’m designing a questionnaire for older adults living in the community, and the education variable is divided into primary, junior, high school, and university. How do you feel about this?

Not at all.

I appreciate the fantastic suggestion, thank you!

My recommendation is to use the number of years of education as a categorical variable. This is because older individuals generally receive less education, and some may not even have completed primary school. For instance, you could categorize it into 0 years, 1-3 years, 4-6 years, and so forth.