Be sure to start off with all columns you need in your data system.
e.g. maybe it's better to add birth date to your users table and calculate age yourself (inline or persisted) than to let the user provide that data himself and commit typing errors.
Here are some interesting articles that may help you with your quest:
Normalization
http://www.sqlservercentral.com/blogs/abhijit_desai/archive/2010/09/07/noramlization.aspx
Codds rules
http://www.sqlservercentral.com/articles/Advanced/coddsrules/1208/
Johan
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