Francisco, this is a very good topic that our date by default can't go back before 1970(the Unix start time) but you would
need it for birth day. Try modify the v30_date_helper.htmpl in bopcfg\www\htmpl\default
--copy this file to site\mods\...folder
--edit the copy...look at
for (var z = nowY - 10; z < nowY + 10; z++)
and if you change nowY + 10 to nowY - 70, you should have 70 more years and this should be good enough for birth days.
--pdm_webcache -H and refresh the browser cache
Thanks
Chi