Universe where if you truly love something, you can keep it from aging. It’s most often associated with soulmates – two people who permanently stay at the age when the two of them fell in love – but it also applies to more abstract objects, like plants or pets.
Character A has been happily with their significant other, Character B, for years. One day though, Character A notices that Character B looks subtly older.
Character C’s childhood dog is still the same age as when Character C picked them up from the pound.
Character D is a superstar that’s barely aged more than a decade even though they’ve been alive for over a hundred years.
Character E’s apartment is covered in plants that are always green and in bloom. Character E makes sure to shower their plants with praise and tell each one how beautiful they’re looking.
Character F has been living with their best friend, Character G, for ages. They won’t admit that they’re in love, but the two of them look much younger than they actually are.