Olden, a.
Old; ancient; as, the olden time. "A minstrel of the olden stamp." J. C. Shairp.
1 other Webster entry under this spelling
Olden, v. i.
To grow old; to age. [R.] She had oldened in that time. Thackeray.
Shades of meaning
Fernald has no entry of its own for olden; he lists it under old.
Where he writes about it:
Olden is a statelier form of old, and is applied almost exclusively to time, not to places, buildings, persons, etc. — from old
As regards periods of time, the familiar are also the near; thus, the old times are not too far away for familiar thought and reference; the olden times are more remote, ancient times still further removed. — from old