to change your sims age you can use boolprop testingcheatsEnabled true and then hold down shift and press on the trash can in front of the lot..you can also use this cheat on other objects (like the mail box!) and on other sims. just hold shift and click.
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As far as I know, there is not a cheat that can make sims younger again. Sorry.
you can buy a cake and then use it
There is a cheat but you can't choose choose your age you only can age up one. You type in the cheat box testingcheatsenabled on and press contol and click and select trigger age transition.
You have to age it into a child first. Testingcheatsenabled true can help with the age transition cheat.
No, there is no cheat code for skills on The Sims 3.