Two Australian men are celebrating the 30th birthday of what is believed to be the world's oldest McDonald's Quarter Pounder, which they purchased in 1995. The burger, now known as the "Senior Burger," has been carefully preserved in its original packaging and has not shown any signs of decay despite not being refrigerated. The owners hope to display the burger in a gallery or museum someday, but Guinness World Records has disqualified their attempt to have it recognized as the oldest Quarter Pounder due to lack of evidence. Despite this, the owners are determined to pass down the burger as a legacy to future generations.