Assuming someone searching for "best shoes for youth" and someone searching "best shoes for old men" have similar enough needs, wants, desires, issues, concerns and problems that could be addressed by the same brand, make and model of shoe, the "best shoes for youth" page should provide an introduction to the shoe, it's feature and benefits as they would appeal to someone searching for "youth shoes" and then link to the product review page for the shoe itself. Similarly, the "best shoes for old men" page should provide an introduction to the shoe, it's feature and benefits as they would appeal to someone searching for "old man shoes" and then link to the product review page for the shoe itself. That way, the "shoes for youth" page and "shoes for old men page" can be optimized for their specific intents and the review page for the shoe itself can be optimized for "shoe name + review" keywords without any of them cannibalizing each other.