Repeating an user input in rest of the places in Microsoft Word docment

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http://superuser.com – I am trying to create a document in which the user will be given some opportunity to enter some text and I would like to use that in rest of the places in that same document. The text entered by the user will be used in many places in the same document and changing the name at any time should get reflected in rest of the document. For example, in the very first page of the document, I would like to have the get the user's name and age and use it in other places as shown in the following screenshot. I tried to use plain text content control to get the name and age. But I could not find a w (HowTos)