Home / Boom / Old Enough To Know The True Meaning Of Happiness – Birthday Card Old Enough To Know The True Meaning Of Happiness – Birthday Card£3.49 Printed In The UK. Envelope Included. Send your best wishes with one of these funny cartoon birthday cards. 12 in stock Old Enough To Know The True Meaning Of Happiness - Birthday Card quantity Add to basket Related products We Shall Fight On The Beaches Animal Humour Greetings Card £3.49 Add to basket 30th Birthday Card Age Is Only A Number £3.49 Add to basket Let’s Get Ready To Fumble Ant & Dec – Valentine’s Day Card £3.49 Add to basket 50th Birthday Card Fully Qualified Grumpy Old Git £3.49 Add to basket