If you have paused them, then they won't be old enough. If they aren't (some tamas are 5 before they become adults) then there is nothing you can do except wait, don't pause them, let them age.
With the exception of a music star, tamas cannot evolve whilst they are asleep. So, if you kept changing the time to when they sleep, they won't be awake and if they are not a V6, won't evolve until they wake up. Just change the time to when they would be awake if that's the problem (all tamas will be awake by 11am).