The ipod nano cater to people of all ages, gender and lifestyles but the affordability and the portability of the product makes it appealing to those of a younger age. 
The iphone is applicable to all demographic groups but it caters to the needs of mature by having phone functionality and diverse applications that cater to the business people to the social butterflies.
The ipad is again applicable to all demographics but its big screen and specialty for reading caters to the needs of all people but it specially caters to those who use the Barnes and noble nook and defers them to the ipad by having more features and internet function-ability
