how old is too old?
For milk: 3 weeks.
For eggs: 6 weeks.
For fresh fruit and veges: 1-2 weeks.
For canned foods: 10 years.
For an internet meme: about 10 minutes.
For a criminal case: depends on the statute of limitations.
For a date: If they could be my mother, or I could be their father.
For a packet: 255 hops, give or take.
For the universe: 14 billion years.
For that joke you keep telling: Twice.
For my own age...every day past my 21st birthday...sigh