No it is not but like I said in my prior post Asada/Kim are expectional athletes.
When talking generally about the ages of non-athletes, I'd say that two years is not much of a difference between ages. But in sport, especially in a sport like figure skating, where a year's results can vary so much from the next, where unpredictability reigns supreme, and where even a few months can bring about so many physical changes and injuries (the young Americans probably aren't even over puberty), I'd say even a year's difference in age means a lot in FS.