Okay, Ive finished the code. Heres what to do:
Make a new layer and insert a keyframe at the start of the bios, and insert a frame at the end. Click on the first frame and put this code on the frame:
agedisplay = new Date();
agedisplay= (agedisplay.getFullYear()-(yearborn));
and make a dynamic text box with the var "agedisplay"
Then, on each of the frames for the bios, just use this code:
yearborn = 1995;
but change 1995 to whenever the person was born.
And thats it! Now it will display the correct age even in years to come!