[![enter image description here][1]][1]

I got a simple idea just create a set of User Parameters 


For example:

    Name: dob	
    User_1$: {__Random(1,28)}/${__Random(1,12)}/${__Random(1922,2000)}

It will return a semi-random date in the format DD/MM/YYYY for user 1.


  [1]: https://i.sstatic.net/E6tYm.png