Storing Version Histories

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data

I am working on a little side project and I am currently trying to work out how to hold a history.
At the top is a document, each document is a series of name / value pairs with the value potentially being a list of name / values itself. Each document is stored within a file and is human, as well as machine, readable.

So I need to contain the history within the document and keep it human readable. I would like to just append the file with the latest version, but that would result in a large file in the end with often only one or two values changing on each update.

My original idea was this:

0 {
  name bob
  age 42
  address {
    house 4
    road high street
  }
}
1 {
  # another year older
  age 43
}
2 {
  address {
    # change the house number
    house 7
  }
}

This works from a storage and retrieval perspective, however after a few versions it could become cumbersome. I can rebuild the content for any version from the previous ones, but is there a better way?

Remember I need to keep it human readable.