New York does not restrict the age of either party in an adult adoption. New York permits adult adoptions between any consenting adults, but a judge can, in his discretionary powers, rule to not allow any adult adoption. The length of time that an adult adoption can take varies greatly, as do the associated costs. An attorney would be able to help you with this. This will also likely help: http://www.ehow.com/info_12029624_new-york-adoption-laws-after-child-18-years-old.html
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Age is not a factor in an adult adoption. You must file a petition and then a Judge must hear the case in order to insure that the process has been followed. Best of luck to you.
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