Aeonian

Aeonian is an adjective that means everlasting.  The word aeon comes from Greek, meaning ‘age,’ as in a period of time like The Stone Age. When used in geology, aeon specifically refers to a thousand million years. Aeonian may mean lasting an aeon or it may simply mean everlasting or eternal, as in: the time Aurora and I spent was limited but our love is aeonian.