I just picked up my old goya and noticed that the tuning keys make this rattle every time i strum it with enough velocity.

What gives? Is it gonna turn into a problem?

Well, it probably means the tuner(s) are loose and could eventually give out, possibly just a nut/washer or screws to tighten?
My reverbnation page

2012 Taylor 310ce
2011 Fender CD140SCE
Ibanez 12 string a/e
73 Epi 6830E
72 Fender Telecaster
Epi Dot Studio
Epi LP Jr
Chinese Strat clone
Washburn Mandolin
Luna 'tatoo' a/e uke
antique banjolin
Squire J bass