I was able to solve the problem of birthdays by calculating age through this tip.:
doitwithwp
And put to work in the taxonomy with adataption of the display:
$rows = get_field('ocupacao', $taxonomy . '_' . $term_id);
After I just needed to create a wysiwyg field it could be just text and put the shortcode and the magic happens =)! I hope to help others who have doubts =).
[show-my-age birthday="02/13/1985"].
