I didn't write these, they are from http://wiki.illemonati.com.
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C (x32010@1)                  EmAaron, (022000@1)you're twenty-one
    FNow (133211@1)you can drink
(F)
The night away
      G (320003@1)   F (133211@1)         EmSo (022000@1)go out and have some fun
G (320003@1) C (x32010@1)                   E7Oh, (020130@1)Aaron, you're growing up,
               FSoon (133211@1)you'll be lying
      Dm7
In an alleyway
         CThrowing (x32010@1)up
C (x32010@1)   G (320003@1)       CHappy (x32010@1)birthday, Aaron (you son of a bitch)
C (x32010@1)    G (320003@1)      CHave (x32010@1)a piece of cake (you son of a bitch)
B (x2444x@1)      Ebm (xx4342@1)   BbBlow (x1333x@1)out all the candles
    A7 (x02020@1)   Ab (xx1114@1)      G (320003@1)      CAnd (x32010@1)make a wish (you son of a bitch)
B-5
(Twenty-one, twenty-one, twenty-one, twenty-one )
His name is Aaron Ackerson,
he's turning twenty-one.
His spiral into oldness
Has officially begun.
                DAustin (xx0232@1)gave him nothing,
E (022100@1)                   F#Grievre (244322@1)gave him less,
Bm (x24432@1)                 DLimekle (xx0232@1)gave him the finger, and
EI (022100@1)gave him a dress.
C (x32010@1)Spacecat, another year's gone by
   FIt (133211@1)seems like it's only been the blink of an eye
CYou've (x32010@1)been rappin' and chillin' for twenty-one years
        FNow (133211@1)you got no choice but to drink a lot of beers
C'till (x32010@1)it's coming out your ears, so get down to Sears,
       FGrab (133211@1)a mug, fill it up, raise it up and say "Cheers"
CYou're (x32010@1)the flyest, tightest amateur DJ
    FYou (133211@1)even did a show in your Scooby Doo PJs
Damn!
D C G
Dm7              GCongratulations, (320003@1)Aaron
Dm7                          GYou're (320003@1)twenty-one and you're glarin'
C (x32010@1)              Am (x02210@1)        G (320003@1)  CYou're (x32010@1)two years out of your teens
              F (133211@1)            G (320003@1)  EbAnd (x43121@3)baby, you know what that means
Cm (x3101x@1)         Ab (xx1114@1)          Eb (x43121@3)      BbNow (x1333x@1)you're a man! (Man!) A man, man, man!
Cm (x3101x@1)         Ab (xx1114@1)          Eb (x43121@3)        BbNow (x1333x@1)you're a man! (Man!) A manny manny man,
Cm (x3101x@1)        Ab (xx1114@1)        Eb (x43121@3)          BbA (x1333x@1)man, man, man! (Man!) You are now a man,
         Ab (xx1114@1)                 Cm7
You're a maaaan  now you're a maaaayon.