The sum of the ages of several people is 4476 years old, the oldest is not more than 79 years old, the youngest is not less than 30 years old, and there are no more than 3 people with the same age, how many elderly people are there in these people? (Anyone who is not less than 60 years old is an elderly person)
若干人的年龄的和是4476岁，其中年龄最大的不超过79岁，最小的不低于30岁，而且年龄相同的人不超过3人，这些人中至少有多少位老年人．(年龄不低于60岁的为老年人)
<result>6</result>