Good idea on the reverting and doing the age up yourself. That issue can be really stubborn sometimes.
Role Sims like store clerks are a bit different. OW will detect and report on their being age stuck, but often cannot grab them away from their assigned stations to force the birthday and sometimes doing so will make them unable to continue working in those slots such as if they were about to become an elder. The Register mod tends to help, but this still happens sometimes. I usually subtract a whole bunch of days from their age with MC (MC Cheats module required) if I wanted them to stay on duty or get rid of them with Total Annihilation (TA) if I had no idea who they were anyway and let a new one be assigned.