ISB ~ 1 Corinthians 15 v51

We shall not all sleep:The last generation that lives to see Christ return may be spared the experience of bodily death. Some scholars interpret this verse to mean that Paul expected Christ to come again during his own lifetime, since he seems to number himself (“we”) among this final generation of Christians. Two considerations, however, suggest these words are rhetorical and should not be taken literally. (1) Elsewhere Paul counts himself among those who would be raised (“us”) from the dead (1 Cor 6:14; 2 Cor 4:14). (2) Paul sees death, through either hardship or martyrdom, as a real possibility for himself in several letters (2 Cor 1:8-9; Phil 3:10-11; 2 Tim 4:6).