I ran my own numbers. This isn't even difficult to do.
Total population over 18, is around 242,500,000
Number of people 65 and older, around 50,000,000
Number of people with a severe disability, around 25,000,000
Number of peoole employed 35 hours a week or more, around 123,500,000
Number of people employed only part-time, around 29,000,000
So just do the math, you get an unemployment rate of 11%. If you want to look only at unemployment related to full time work then you're at 26% unemployed.