Age Verification

I am using this module as an age verification gate, and it is working very well. One thing that I would like to change about it is the years shown in the drop-down menu. I am asking the user to enter his/her date of birth, and I would like to make the maximum year the current year, and the other years to descend instead of ascend. Would anyone be able to help me accomplish this? This is my first issue submission so I'm sorry if this is not the proper place for this question.

Thanks