sql server - Select row where all records with similar row meet condition -

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i have table many records, example..

id | user id | date 1  | 1       | 2014-05-26 2  | 1       | 2015-05-08 3  | 2       | 2014-05-20

i trying select user_id records date more 6 months passed, dont include them if there record same user_id not meet criteria. example, want return record user id 2.

my issue can 

select user_id table datediff(month, date, getdate()) > 6

but still return record user_id 1. sure super easy have not been able make progress on this.

just take statement , take other away:

    userswithyoungerdates     (         select user_id         table         datediff(month, date, getdate()) <= 6      )     select user_id      table      datediff(month, date, getdate()) > 6     , user_id not in(select user_id userswithyoungerdates)

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