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You create a Mii then import into Wii Fit. Put in the age when you bring the Mii in and there you have it a baby for the Wii Fit.
25 is the best age and 26 is the 2nd best age
BMI is how fit you are. In accordance to your height and age, you should be a certain weight. You cannot really just 'change' it. The only way to change it is to start using the Wii Fit and do some workouts!
There is now the Wii Fit Plus (an addition to Wii Fit) which allows multiplayer mode.
Wii fit plaza is the place where you choose your mii, or your person, so that you can do the wii fit test for the day.