Does anyone have an idea about their age?

First, There are no mentions about their ages aside from Ch16 when Heinley said he wished he was born 5 years earlier So does that mean they have 5 year gap?

Second, they only mentioned Sovieshu and Navier being married for “many years” hence the anxiety of not being able to produce an heir after being together for ample time.

Third, there is no mention of what age they assumed the throne which would have been at least a hint of Heinley’s age because of his remark about being born 5 years earlier

Trashta, I reckon to be quite young as she is so dumb and ignorant pf so many things.

So if i were to ROUGHLY guess their ages, I like to think that their ages are:
Sovieshu: 30
Navier: 29
(And they assumed the throne at 21 and 20)
Heinley: 24 or 25
Trash: 20

Any thoughts? I’d love to know your inferences too!