These people aren't counted in the unemployment rate because they aren't in the labor force. They are part of the group not participating in the labor force participation rate metric.
https://www.bls.gov/cps/cps_htgm.htm
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"Who is not in the labor force?
As mentioned previously, the labor force is made up of the employed and the unemployed. The remainder—those who have no job and are not looking for one—are counted as not in the labor force. Many who are not in the labor force are going to school or are retired. Family responsibilities keep others out of the labor force. Since the mid-1990s, typically fewer than 1 in 10 people not in the labor force reported that they want a job.
Who is counted as unemployed?
People are classified as unemployed if they do not have a job, have actively looked for work in the prior 4 weeks, and are currently available for work"
Labor force participation rate chart: https://www.bls.gov/charts/employmen...ation-rate.htm