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