I just found this forum. I'm 26 now and went into DEP Oct 4, 2016 (when I was 25). I scored a 96 on my ASVAB and auto-qualified for nuclear. I initially chose EM for my rate as there were no slots open for female nukes! Had a ship date of June 13. I got my nuke contract in January 2017 with a new ship date of Sept 16. Had my interview with a special investigator contractor from the NBIB at the end of June. I had 2 credit card accounts in collections with a 3rd party from my (stupid) college mistakes and a 3 month bout of unemployment after graduation. They've told me that's why my clearance is taking so long to get adjudicated? They just told me today that my ship date got pushed out to November... My job is replacing me in a couple of weeks, per my original ship date, so I'm putting in a DAR to get a different job ASAP because I will be without income after Sept 16!!!
Also, they don't tell you this because apparently my recruiters have never seen clearance take this long (just my luck) but nukes can be in DEP for up to 15 months whereas non-nukes can only be in for 364 days. However, if at 15 months your clearance still hasn't been adjudicated you'll have to pick another rate and ship out... I can't wait 7 more months (15 months total) with no, or significantly less, income and zero guarantee that I'll get to be a nuke still.
The 18 year old male nukes that I've seen in DEP over the last 10 months are all gone, their clearances came through quickly and they got rolled out to basic early.
Good luck!