for what age group is legoland?

It's designed for kids that are of the Lego age, which would exclude most teenagers.  In Florida, Legoland is way cheaper than WDW or Universal, so for cash strapped families with younger children it's a better value than WDW or Universal. However there are some rides that would appeal to older ages, but most rides are intended for younger kids.  They also have really cool things built out of Legos, like a full size Ford Mustang, miniature replica of Manhattan, miniature Space Shuttle etc..  Those are interesting to all age groups.

Any age can go to Legoland but a lot of the attractions are oriented to younger people.in the age range 2 - 12.

it is mainly for kids