Days not working

Ive written a query to find out if users passwords will expire soon:-

SELECT [_Users].User, [_Users].[Currently Employed], Max([_Users_Passwords].Changed) AS [Last Changed], DateDiff("d",[Last Changed],Now()) AS DaysSince
FROM _Users INNER JOIN _Users_Passwords ON [_Users].User = [_Users_Passwords].User
GROUP BY [_Users].User, [_Users].[Currently Employed]
HAVING ((([_Users].[Currently Employed])=True))
ORDER BY [_Users].User;

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Which works great, and gives me all the users and the date of their last password, and how many days its old. However I want to only view the passwords  which are older than 90 days, so put a "WHERE DaysSince >90":-

SELECT [_Users].User, [_Users].[Currently Employed], Max([_Users_Passwords].Changed) AS [Last Changed], DateDiff("d",[Last Changed],Now()) AS DaysSince
FROM _Users INNER JOIN _Users_Passwords ON [_Users].User = [_Users_Passwords].User
GROUP BY [_Users].User, [_Users].[Currently Employed]
HAVING ((([_Users].[Currently Employed])=True))
WHERE DaysSince >90
ORDER BY [_Users].User;

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But keeps telling me I have a syntax error. I changed it to a 'Having':-

SELECT [_Users].User, [_Users].[Currently Employed], Max([_Users_Passwords].Changed) AS [Last Changed], DateDiff("d",[Last Changed],Now()) AS DaysSince
FROM _Users INNER JOIN _Users_Passwords ON [_Users].User = [_Users_Passwords].User
GROUP BY [_Users].User, [_Users].[Currently Employed]
HAVING ((([_Users].[Currently Employed])=True) AND ((DateDiff("d",[Last Changed],Now()))>90))
ORDER BY [_Users].User;

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But still says there is a syntax error in my query.

Can anyone see where Im going wrong with this please?