if you can find proof that Joseph was 90 years old when he married the virginal teenaged Mary, and that he had other children by another wife FROM SCRIPTURE, the Authorized Version, then I will give you a hearing.
You are correct in stating that Scripture is silent on Joseph's age. You are incorrect in assuming this means your preconception is correct.
SD
And since we know that Scripture didn't even address the history of Joseph, the strawman that you've created is most apparent. Fortunately, we also have Holy Tradition, of which Scripture is the greatest part.
Reminds me of those folks who refused to eat potatoes because they weren't mentioned in Scripture. Or those folks who think it's somehow significant that Jesus never mentioned homosexuality (that the term itself didn't exist until the 1800's being overlooked) in Scripture.
Yeah, if it's not in Scripture, it just can't be, huh?