Genesis chapter 5 has lots of factoids about how many “years” a man lived before he had children followed by how many total years he lived. If you replace years with months it makes more sense for the lifespan, typically 800 or so “years” although replacing years with months would indicate the early humans had offspring at a very young age by our standards. Which doesn’t surprise me all that much I guess.

Not sure how the YEC’s deal with all the generations of people in Genesis 5 who allegedly lived for 900 years or so.