From Longman Dictionary of Contemporary Englishgrand (old) agegrand (old) agean age when someone is quite old She had reached the grand old age of 80. → grand
Examples from the Corpus
grand (old) age• The house, despite its grand old age, is welcoming and comfortable.• In 1989 the Society reached the grand old age of 100 years.• But even at the grand old age of 28, he was keen to give it a go. 