Adding a constraint

I have a question on adding a constraint to a table.

The following are my tables.

1. Attribute table that will define the attributes

Code:

[U][B]Attribute[/B][/U]
AtId       AtName
1            Age
2            Gender

2. Attribute value table that will store value for attributes

Code:

[U][B]AttributeValue[/B][/U]
AtValId     AtId               AtDesc
1             1                    10 - 20
2             1                    21 - 30
3             1                    31 - 40
4             2                    Male
5             2                    Female

3. User table that will contain list of users and their profile

Code:

[B][U]User[/U][/B]
UserId    User Name         Age   Gender
1           Matt thompson    2        4

Is there any way to set a constraint on the columns Age and Gender of User table to have the values only from attribute table?