How to access a struct member inside a union in C?

I have the following union:

union employee
{
    char key;

    struct manager
    {
        short int age;
        float shares;
        short int level;
    };

    struct worker
    {
        short int age;
        short int skill;
        short int department;
    };

} company[10];

How can I access a member of a structure which is inside the union employee? I tried to access the age member of the manager structure this way:

company[i].manager.age

But I get error C2039: 'manager' : is not a member of 'employee'.