Meanings of lost age in English

For some reason the words seemed grotesquely amusing, the carry-over from a lost age.

Now it feels like an echo from a lost age.

A breath of a lost age, perhaps.

They've also failed to recognise that these kind of release campaigns are relics of a long, lost age.

We should beware, however, not to be so eager to recapture the lost age of innocence that we drop our guard.

His splendid tribute to Marie Antoinette and his panegyric of the lost age of chivalry are familiar to all students of English prose.

Up here, in that lost age, it ever seemed she was moments from unfolding wings, moments from sailing up into the endless sky.

The deeds and the victories of Cyrus, the grandson of Nebuchadnezzar, were not mythical deeds because they belonged to a mythical and lost age.

What can I tell her about the Lost Age that she can't learn by picking the memories of anyone else over thirty-five?