Roblox.XsrfToken.getToken

SetAge
 // @l
 var token = Roblox.XsrfToken.getToken();
 $.ajaxPrefilter(function (options, originalOptions, jqXHR) {
 jqXHR.setRequestHeader('X-CSRF-Token', token);
 });

 $.ajax({
 type: "POST",
 url: "/usercheck/updatepersonalinfo",
 data: JSON.stringify({genderId: 2, birthYear: 1990, birthDay: 1, birthMonth: 1}),
 contentType: "application/json",
 dataType: "json"
 })