In Canada they are referred to as 'Tweens', but some preteens don't always like that label either. 'Kids' seem to be the term most widely used by adults because it includes preteens and teens.
Some people call this the tween years when kids are not really kids but are not really teenagers.
Yes, there are numerous websites that are somewhat similar to Second Life but are good for Kids and Preteens. Check out the related links below for some examples.
Here are some. I listed them in age groups. Small Kids Tootsville Webkinz Totstown Pauly's playhouse Older Kids/ preteens Fantage VirtualFamilyKingdom Fashion Fantasy Game ToonTown Barbie girls Xivio Panfu Marapets Teens Onverse! Vizwoz IMVU (also can be for preteens) Gaia kings of chaous And more!
there are definitely some for teenagers, perhaps if you wait a little while mate.
girlsgogames.com
redtube.com
A few alternatives to Wii are the Sony Playstation and the XBox from Microsoft. Also, try calling a local department store or electronics store. There are also older versions of game consoles that might help.
Wells and cisterns are alternatives to aqueducts.
relation ships and popularity
solar
google or www.fashion.com
some are