I wish I had the time to be an expert on isochronic dating, etc.
Isochron dating isn't hard at all. I think I can explain it to you in a few minutes.
In a rock different minerals uptake different elements at different rates. For example a particular mineral A might incorporate 5 uranium atoms for 2 lead atoms, while a mineral B might incorporate 7 uranium atoms for 8 lead atoms. The actual values are different, of course, but this has been lab-verified. However, these minerals
do not discriminate between isotopes when they incorporate minerals. For example, if there are 2 atoms of lead-207 to 1 atom of lead-206 in the rock, then the minerals will
all have about 2 atoms of lead-207 to 1 atom of lead-206 making up their lead atoms. This is also lab-verified, with measurable but extremely small differences due to external conditions. Now when the rock first solidifies, the ratio between isotopes is common to all the minerals, but the ratio between parent and child element is different.
Now, a few billion

years later we analyse the makeup of those rocks. We then plot the graph of ratio-between-isotopes (y) to ratio-of-parent-to-child (x). If the rock had just solidified, the graph would be flat because all the minerals would have the same y-value. However, if the rock has undergone decay, for each mineral the y-value goes up because the child isotope is being produced while the non-child isotope isn't, while the x-value goes down because parent atoms are being transformed into child atoms. It can be proven mathematically that the resulting points still fall on a straight line, and the slope of that straight line can reflect the age of the sample.
Think of it this way. I have a few sacks, each of which I fill with some rotten fruits - 2 rotten apples for each rotten orange - and some fresh apples. I leave the apples to rot. What do I need to assume about the system to figure out how long the apples have been rotting? I only need to know that the apples rot at a constant rate, and that the initial ratio of rotten apples to rotten oranges was constant. Try it yourself!
And all this from Google. Not even TalkOrigins. But note that no, I don't have to assume anything about how much
child isotope there is initially. Heh.
Others chose science, devoid of and contra to any supernatural causes, as their bias. That's fine, but with origins (of universe, life, and all life's forms), I think such a bias can be misleading.
Think of it this way. What would you think of a Christian scientist who came up with a research paper dealing with the physics of Jesus walking on water? If the paper mentioned "God did this and did that and we don't know how", you'd immediately say it's not being scientific. The paper can't possibly analyse God in a causal manner so what is God doing there in it?
Now substitute the physics of Jesus walking on water for the physics of mega-accelerated nucleon decay with magically vanishing decay heat.

You can be biased towards a Creator, no problem. I am and most good Christian scientists are. But don't imagine that what you do is scientific (
scientific, not
true) if it allows for a non-analyzable, non-causal influence like God.
Sorry. It has to do with God creating a mature universe. Perhaps he created a star with its light path already extended to us.
Theologically faulty. Your own AiG discourages this.
Or perhaps, in the big bang of creation, light traveled at a speed far exceeding the constant we recognize today.
And without the universe falling apart at the seams? Sorry, but one moment you say the universe was fine-tuned for life, and the next you say God messes around with physical constants to make a young earth look old. You can't have it both ways. If the universe is fine-tuned then God can't mess with it without obliterating life as we know it.
ID attempts to suggest that science (the naturalistic process we use to expand our knowledge of the universe) cannot explain all that we see.
See, that's the problem with creationism. It's trying to create a niche for God: What science cannot explain, God can! Firstly as I have said before a doctrine of God's occasional supernatural interference must start with a doctrine of God's normal natural apathy. Secondly, what happens when science starts explaining things? Then our little niche that we have carved for God becomes smaller and smaller and smaller - until we can only either see God in all of science as well as outside it, or say that science is simply wrong and technology has no right to exist. Your choice.
What makes you think that the vast amount of information in the DNA, which is far more complex than Internet Explorer, in the first living cell, which (even apart from the DNA) was far more complex than the space shuttle, was formed by anything other than intelligence?
Intelligence using evolution!
