But grant, the virtues of a temp'rate prime Bless with an age exempt from scorn or crime; An age that melts with unperceiv'd decay, And glides in modest innocence away; Whose peaceful day Benevolence endears, Whose night congratulating Conscience cheers; The gen'ral fav'rite as the gen'ral friend: Such age there is, and who shall wish its end?
The speaker says that it would be good to be granted the benefits of a moderate prime of life, one in which we're free from scorn and crime.
It would be good to have a life that moves forward without our bodies' apparent decay, one full of innocence.
The days and nights of this moderate life are also full of peace and benevolence and conscience. It's a life in which we're favored as friends. It's possible to live such a life, and the speaker asks, who would want such a life to end? Not us, that's who.