The ages of the 5 old people are different, the oldest one is 6 years older than the youngest one, their average age is known to be 85 years old, how old is the oldest one among them.
5位老人的年龄互不相同，其中年龄最大的比年龄最小的大6岁，已知他们的平均年龄为85岁，其中年龄最大的一位老人是多少岁．
<result>88</result>