That in fact, the people who are young enough to benefit from these first therapies that give this moderate amount of life extension, even though those people are already middle-aged when the therapies arrive, will be at some sort of cusp.
事实上，很年轻的人 会从这些实验治疗方法受益， 能使人们的生命适量延长， 即使这些人已经中年，当这些治疗方法来到 人们还可以尝试治疗方法。