Hi,
On the following page you could find the Product Longevity chart, which includes life cycle of each family, and the lunched date, you could use it as reference:
http://www.freescale.com/webapp/sps/site/overview.jsp?code=PRDCT_LONGEVITY_HM
Additionally, the part details page of MCIMX6X4AVM08AB indicates that it is Auto qualified, which means that its life cycle is more than 10 years; please refer to the following page:
http://www.freescale.com/webapp/search.partparamdetail.framework?PART_NUMBER=MCIMX6X4AVM08AB
Hope this will be useful for you.
Best regards!
/Carlos
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