I think it should be fine to use if it has been stored inside, mine is from 2001 and I will be using it. There's plenty of older airplanes flying around with fibre glass parts from the 90's.
One caveat...the older polyester/glass cowls were not nearly as good as later epoxy/glass with honeycomb and foam core. I see your signature says RV8, so not a factor for you....it's an epoxy cowl.
Really, I'd rather have that 2007 vintage cowl, plain green, no gel coat.