What puzzles me is that most YECs allow for an age of up to 10,000 years.
In fact, while believing in 7,000 to 10,000 years, they are willing to grasp at "evidences" of
millions of years, such as in the tired old "sea salt" PRATT. When a creationist presented that PRATT and I pointed out that millions of years still contradicted his YEC position, his response was "Just so long as it's not BILLIONS of years
as science says that it is!" IOW, their goal is not to develop and present a coherent model for the earth's age, but rather solely
to oppose science and to try to discredit science in any way possible. They're not trying to show that they are right, but only that science is wrong.
And my personal opinion about them claiming 10,000 years instead of the circa 6,000 that their misinterpretation of the Bible demands is because of the central deception of "creation science", their game of "Hide the Bible" in which they lie that their opposition to evolution is based "solely on scientific evidences and has nothing whatsoever to do with religion or the Bible." If they presented a number that was too close to their biblical chronology then that would be a dead give-away, so they rounded it up to 10,000. They could just as easily taken it to a million or even ten million,
just so long as it said that science is wrong. Well, that's my own opinion on that question.