The Aegean reaches full physical maturity between twelve and eighteen months of age, settling into the medium-sized, muscular build that reflects centuries of natural selection on the Greek Cycladic Islands. Adult males typically weigh between nine and twelve pounds, while females range from seven to ten pounds. The body is well-proportioned and athletic without the cobby heaviness of some breeds or the extreme elongation of others — a functional physique suited to climbing, jumping, and the agile movement patterns that sustained the breed's ancestors as semi-feral hunters and fishing village companions.
The adult coat is the Aegean's most visually distinctive feature. Semi-longhaired with a moderate undercoat, it displays bicolor or tricolor patterns that always include white as the dominant base color, typically covering at least one-third and often two-thirds of the body. The colored patches can be black, blue, red, cream, or tabby in various combinations. Coat texture is silky rather than woolly, which reduces matting relative to breeds with denser undercoats, though regular grooming remains important. Seasonal variation in coat density is common, with the fur thickening noticeably in autumn and thinning during the warmer months.
Eye color in the adult Aegean ranges from green to shades of gold and amber, with green being the most common and most prized in the breed standard. The eyes are almond-shaped and set slightly obliquely, giving the face an alert, intelligent expression. The ears are medium-sized with slightly rounded tips, and the tail is moderately long and well-furred. Overall, the adult Aegean presents a picture of natural, unexaggerated beauty — a cat shaped by environment and function rather than by selective breeding for extreme features.
The breed's physical robustness is one of its defining advantages. Because the Aegean developed as a landrace rather than through controlled pedigree breeding programs, it retains a broad genetic base that contributes to overall constitutional vigor. This does not mean the breed is immune to health problems, but it does mean that the concentrated hereditary conditions found in some heavily line-bred pedigree cats are less prevalent. The adult Aegean in good health is a resilient, energetic animal with a strong constitution.