Adoption & Biological Father's Rights?

Okay my son will be 18 this year and he wants to be adopted by his stepfather. At what age does he no longer need his biological father's consent to be adopt? It would be under Missouri state laws. Please provide how you know the answer, too. Thanks.
Woah, tell me when you find out. I'm 15 and I have to get alike thing taken care of.
You could (maybe should) put this one to one of the many legal Q&A forum websites, but commonsense suggests that once the boy is of legal age he can do what he requirements. What's the legal age in Missouri? Once of legal age, a soul really doesn't have to answer to anybody for anything; they are on their own. The biological father (or even the adoptive father) would have no control over the boy once he is legally developed and any form of consent should not be required for anything.
Answers:    Dear Honest,

Missouri state statutes allow for adult adoption at the age of 18 as long as the character being adopted consents to it.

http://www.mobar.org/c5bd7c84-bcbe-40c3-…

The information/forms needed can be found in local probate or familial courts.

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