Date Field Size

How can I expand the date field to be wider?  I would like the "Birthdate" and "Age at last Birthday" to span across that whole row.

Thank you!

Add the following custom css code should align the fields as per your expectation.

You can adjust the width size as per your requirement in the code specified below:

li#id_17 {    
width: 300px;
}

li#id_32 {    
float: right;
width: 400px;
}