That's true, he does. I'm not sure how coherent such an explanation can be, however.
There are many forms of this thought experiment, but here is my favourite:
Suppose you go into a coffee shop, and as you are sitting down with your Fair Trade mocha, you notice an old man in the corner, quietly counting backwards. As you sit down, he says, "73, 72, 71..." and you continue to surreptitiously listen, slurping your coffee, until he says, "3, 2, 1," and sits back with an air of great satisfaction.
Burning with curiosity, you lean over, and ask him, "Why were you counting just now?"
"I am an angel," he replies, "and I have been counting backwards from infinity since the beginning of time."
"And you've just got to zero?" you ask.
"That's right," he says, and getting up, he heads over to the newspaper rack and selects a copy of The Guardian.
Now supposing that immortal angels exist, just for the sake of our experiment, do you think that this angel can be telling the truth? The question the thought experiment raises is this: if the universe were infinitely old - or, if you prefer, there is an infinite regress of causes - how is it that we come to arrive at
now? Does this thought experiment demonstrate that infinite regresses and infinite age are absurd?