The age of the actor doesn't matter if this is what they looking like behind the mask
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If they gotta show before the transformation that shit will take 10-15 minutes of screen time and then the remaining 3-4 movies it's a mask and movie make up. Niggas in here crying about the shit LOLOLOL that don't matter.
You could have Jerry Seinfeld play Doom before the transportation and have Tyrese Gibson playing the voice it's not going to matter and niggas won't know or care as long as that shit come out dope.