But they patched it in with the latest update.
This it what the patchnotes say:
Part-Time Jobs Update:
And last but not least (you still with me?) all existing Part-Time Jobs are no longer just for Teens. That’s right, now elders could work as Fast Food Employees. Young Adults could be Babysitters if they want. Why not? The Part-Time world is your oyster. Oh oh oh -- and one last thing on that note: You can now have two Part-Time Jobs at once and pick between shifts. Wowee.