Ginny was the first girl born in 7 generations. 7 dragons mentioned in the series. 7 Defense Against the Dark Arts teachers. 7 classes in Harry’s first year. Harry and Ron were spotted by 7 muggles while driving the flying car in their second year. Dumbledors Army went through 7 doors in the Ministry of Magic in the Order of the Phoenix.
can’t think of any more :P
54 is too young to die.