Which of these famous retail taglines has been in continuous use for the longest time, dating back to its original introduction?

Throughout retail history, some taglines have become so iconic that they've transcended mere advertising to become part of our cultural lexicon. These powerful phrases have helped build billion-dollar empires and created instant brand recognition across generations. This trivia question challenges you to identify which famous slogan has the longest historical legacy, dating back to a time when modern marketing was just taking shape.

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De Beers: 'A Diamond is Forever' (1948)
Nike: 'Just Do It' (1988)
McDonald's: 'I'm Lovin' It' (2003)
Apple: 'Think Different' (1997)