Why do so many people assume the ages of Biblical men were given in months instead of years even when it makes no sense when they became fathers?

Why do so many people assume the ages of Biblical men were given in months instead of years even when it makes no sense when they became fathers?
https://askjohnmackay.com/life-spans-genesis-methuselah-lived-969-years-long-life-spans-real-years/

Please read this long article!

Many people claim there is a translation but if we apply this with when they became fathers, that would make them an absurd age of 5 or 6 years old. You can't beget a son at 66 months. Clearly these are years.

Why do so many people still think these ages are in months instead of years?
Updates:
24 d
I meant mistranslation
Why do so many people assume the ages of Biblical men were given in months instead of years even when it makes no sense when they became fathers?
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