Honestly I mostly use it as a jumping off point for my code or to help me sound more coherent when writing emails.

The rule I always heard was older_age/2+7. In this case, 51 would give you a rough range of 32-88.

30 might be a little weird, but just depends how you guys gel

Id be interested to hear which are which. My guess are: Family Guy - Oversimplified Hit-Wonder - Grey Titans - Sam and Kurzgesagt