The question of how to aggregate over time may even have important consequences for population ethics paradoxes. You might be interested in reading Vanessa Kosoy’s theory here in which she sums an individual’s utility over time with an increasing penalty over life-span. Although I’m not clear on the justification for these choices, the consequences may be appealing to many: Vanessa, herself, emphasizes the consequences on evaluating astronomical waste and factory farming.
The question of how to aggregate over time may even have important consequences for population ethics paradoxes. You might be interested in reading Vanessa Kosoy’s theory here in which she sums an individual’s utility over time with an increasing penalty over life-span. Although I’m not clear on the justification for these choices, the consequences may be appealing to many: Vanessa, herself, emphasizes the consequences on evaluating astronomical waste and factory farming.