They don't tire like the rest of us who have done enough that we often feel like we need a rest. They approach many things with a clean slate. They don't have many of the old prejudices that we older adults have. This is why there is often less of a problem with racial bigotry among the young than among the old. But with these things there are some dangers.
Young people are sometimes naive.
They do not have the value of experience. They often give into the siren call of temptation that the old have faced. And, the young are less likely to listen to older people who warn about mistakes because they are so idealistic. The church needs their zeal and fire for the Lord. We need their energy.