This is kinda hard to explain. I hatched 3 tamas yesterday all around 11 am. They evolved into toddlers as usual. I went to work and paused from 1pm to 4pm (3 hours).
Today around 2pm they all turned 1 year old but none of them evolved. This doesn't make sense because the equivalent of the 3 hour pause has gone by already. And my tamas always turn into teens at age 1. ^_^
Toddlers normally evolve into teens after 24hrs unpaused - it is not always linked to their age on the screen. It is linked to the 24hrs as a toddler.
However, when you pause them it affects the evolution.... you already know that of course, but I am sorry to say that it is not always in direct proportion to the amount of time they were paused
i.e. they will not simply evolve three hours later if you paused them for three hours
The longer you pause them, the longer it takes for them to evolve.. but it can't be long now... be patient ^_^