Gerade wurden die Großstadtabenteuer von Architekt Ted, Womanizer Barney & Co.
Sometimes the younger generation is more mature, or the older generation is less mature - the latter especially helps writers to dodge away from worrying questions being asked about sexual attraction. Only, one is about twice, or even three times the other person's age!Considering their differences in life experiences and worldviews, how do they relate? Assuming this is actually a platonic friendship and not something far more sinister, or for that matter an overtly stated mentoring situation, intergenerational friendships can be pretty weird.Either way, the situation that leads to their friendship would often be something out of the ordinary, since in real life, people of two widely different age groups generally do not reach out to each other.
If it's an adult and a child who are friends, in modern stories, expect someone to misinterpret it as being sexual, and violence to possibly result.As for how they become friends, it could well be contrived circumstances that bring them together, or a shared life experience.