According to the transcript Tameem said "He
IS " , not just "a decade and a half".
Tameem didn´t reply by mumbling "a decade and half younger than me", he started the sentence with HE IS, and if you ask me it sounds like he speaks of it as a fact.
And whether people aren´t being exact when they say "decade and half" is your opinion as far as i am concerned, and if you want me to BELIEVE your words then go ahead and present to me a source that states that. Because i could picture myself saying "decade and half" instead of "15". Neither do i see how i am not being exact by using "decade and half"
Decade = 10 years
Half of a decade = 5
10+5 = 15.
If Dante is not 23 and actually older than that, 24 or 25 then he´s one immature talking person.
Will be very interesting if he´s 23 (for my sake)
Find that magazine if you can. Though i am pretty sure the magazine most likely talked about possible age. There are still sites that believe DmC is a prequel