Information Input

First Name:
Last Name:
Date of Birth:

By checking this box you are agreeing to the running of this function:

function displayUserLifespan(){  
                  let firstName = document.getElementById("fName").value; 
                  let lastName = document.getElementById("lName").value; 
                 
                  if (firstName + lastName){ 
                  document.getElementById("showinputhere").innerHTML =  
                      firstName + " " + lastName + " has been alive for";
                  } else { 
                  document.getElementById("showinputhere").innerHTML =  
                      "Not enough data provided.";
                  } 
                }