When is age lock in?

seatbelt

New Member
I've been reading through the forums for well over an hour, as I know this question has already been talked about not to long ago, but with no luck finding it, so.... at what point in this whole process is your age locked in? Is it after you interview, receive the TOL, FOL? I have my ATSAT scheduled in Baltimore this week, and I'm worried about hitting the age 31 mark, which is in July, before I get to the point that my age is locked in. Thanks
 
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