It happens to everybody; every memory has a lifecycle, and the accuracy diminishes over time. That's part of why they try to get crime investigations going in the first 48 hours -- when eyewitness accounts are most reliable.
Plus when we were kids there was so much less to remember.. just a few years of life really. Now the database is overloaded, and can barely find a nook or cranny in which to store new stuff.
These days I consider my mind more of a well-intentioned interpreter than a credible witness. 
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“We use our minds not to discover facts but to hide them. One of things the screen hides most effectively is the body, our own body, by which I mean, the ins and outs of it, its interiors. Like a veil thrown over the skin to secure its modesty, the screen partially removes from the mind the inner states of the body, those that constitute the flow of life as it wanders in the journey of each day.”
— Antonio R. Damasio, “The Feeling of What Happens: Body and Emotion in the Making of Consciousness” (p.28)
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