אֹמַ֗ר אֵלִ֗י אַֽל־תַּ֭עֲלֵנִי בַּחֲצִ֣י יָמָ֑י בְּד֖וֹר דּוֹרִ֣ים שְׁנוֹתֶֽיךָ׃
I say: 'O my God, take me not away in the midst of my days, Thou whose years endure throughout all generations.
Read kabbalistic (mystical) interpretation of Psalms 102:25: and classical mystical sources.