Just a brief thought here. . . If we want to suffer well at the end of our lives, assuming that we are given the opportunity by God of learning intensely from the school of suffering in the days leading up to our death, it is best if we do some preparation in advance.
While anything is possible with grace, it is not very likely that we will suffer well at the end of our lives if we have not learned, in the smaller everyday annoyances and pains of life, to unite our crosses with Christ. If, however, in our younger days we do practice the virtue of uniting our smaller sufferings to Christ, we will be much better prepared to be able to unite much larger sufferings to His cross as well, should this be what our Lord permits us to endure at the end of our lives.