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First, there are few middle-aged adults in Kanto. Most people players encounter are either children, teens, or elderly folks. The middle-aged men players do meet are mostly either gym leaders or employed as criminals under Team Rocket - perhaps a consequence of being unable to hold down a job after returning from the battlefront. The player character, Red, does not seem to have a father, and his rival, Blue, doesn't have parents at all.
Second, elements of Kanto's infrastructure hint at a possible conflict. Kanto has an abundance of gyms and hospitals (Pokémon Centers), but doesn't seem to have many entertainment hubs, such as movie theaters. Additionally, Kanto's network of underground tunnels could have originally been created as bomb shelters.