The DWP has published their Auto Enrolment Review 2017.
Among their proposals, the DWP has confirmed that the lower age criteria will be reduced from 22 to 18. The auto enrolment review also plans to have pension contributions calculated from the first pound earned. This is rather than the current lower earnings limit of £5,876. This effectively removes the 'Entitled Worker' category. Unfortunately, these reforms are not expected to be brought in until the mid-2020s. And many industries do feel this is too slow.