Kidult

The portmanteau coinages kidult, rejuvenile, adultescent refer to adults with interests traditionally seen as suitable for children. It can also have other meanings, such as a parent who enjoys being a parent due to spending quality time with his or her children, but is reluctant to lay down the law or handle the more serious aspects of parenthood...
Found on http://en.wikipedia.org/wiki/Kidult

Kidult

An adult who enjoys films, games, TV, clothes, etc., which are deemed more suitable for children or much younger people
Found on http://www.encyclo.co.uk/local/22643
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