אָכְל֤וּ זָרִים֙ כֹּח֔וֹ וְה֖וּא לֹ֣א יָדָ֑ע גַּם־שֵׂיבָה֙ זָ֣רְקָה בּ֔וֹ וְה֖וּא לֹ֥א יָדָֽע׃
Strangers have devoured his strength, And he knoweth it not; Yea, gray hairs are here and there upon him, And he knoweth it not.
Read kabbalistic (mystical) interpretation of Hosea 7:9: and classical mystical sources.