Still want to be cool but are afraid you no longer know how? Be not afraid – old is the new young!You dye your hair, you happily order the weekly shop online, you're planning a trip to South America and even know who won Big Brother this year. But last week you also told your kids that G4 are 'sick' and were promptly silenced by looks of utter scorn.Stay away from language that has no right to come out of lips that are more than 45 years old…make that 35…no, make that 14. No-one over the age of...