Which might or might not be statistically significant. I would assume the number of users re-creating their Slashdot account to ensure they do not keep the same over time would be statistically insignificant.
It does not mean they are not there, you are obviously a living proof of this, just means that broadly speaking, most people tend to stick to their account they've created, rather than re-creating them over and over. Thus the assumption can be made about the relationship between userid and age, even if it is not directly applicable to you.

I am sure he referred to Chrome.

I have had Chrome eat 8 GB of memory on my 6 GB machine - I love Chrome and use it over FF for almost a year now, but it is not without faults.

Chrome has been a bit better on turning out fixes, but giving that FF is trying to adopt a faster paced delivery. If it is successfully implemented then they might soon do it in the same speed as Chrome, or perhaps even faster, only time will tell. This is the advantage with competition.