It is here suggested that an extra long life was the original thought. Various Messianic interpretations have been advanced for this psalm but there is not evidence to show that such far off matters were the subject of the poet's song. Though the versions give 'everlasting doors', the construct expression should, one would think, be translated 'doors of old time' or 'ancient doors'. Even if a future reference could be proved, since the doors were terrestrial objects, they would not be 'everlasting'. The view that the psalmist here envisaged the entry of the Messiah into 'heaven', involves concepts not found elsewhere in the O.T., so is not considered here.
Proverbs contains two examples - the same sentence repeated.
Ancient landmarks' is obviously meant. No remembrance at all' seems adequate - both are forgiven, 'out of sight, out of mind'. Isaiah and Jeremiah both contain many examples of olam bounded both as to beginning and ending. Now I will cry out'. Me olam must mean 'from long ago' or 'for a long time'.