What really surprised me though was the fact that you have to be 25-years-of-age to compete. There will be no 18-24 age group. Very odd for they tell me that excluding the 18-24-year-old age group in a swim meet in is considered a sin in both Norse mythology and USMS age-group standards. Does this mean that WRs set in the 18-24-year-old age group are not recognized? I guess not. It simply must be a peculiarity that the USMS cares more about young adults swimming. Go America!
Here it comes from the "horse's mouth:"
It is my great pleasure to welcome the Masters Family to its major 2010 rendezvous, the 13th FINA World Masters Championships, to be held from July 27-August 7 in the Swedish cities of Gothenburg and Boras. This competition will once more reinforce the values of friendship, understanding, fitness and competition between athletes of over 25 years old
With the FINA World Masters Championships, we want to prove that even when retired from the high level competition, our athletes are still capable to delight us with their performances. Thousands of athletes, from 25 years old up to 90 or more, confirm that the aquatic vocation is still there no matter the age.
[Except for 18-24-year-old age group :-p ]
Also, note how soft the qualifying times are. Wow!