There's an interesting example of this kind of personal influence and credibility right there in the Good Book. In the Acts of the Apostles John and Peter healed a crippled man. It created an uproar in the city. The Jewish religious officials called them on the carpet and threatened them for preaching the Good News and for creating a spiritual crisis among the populace. Of course, the healed man was standing right there in front of the tribunal. Everyone knew he had been crippled all his life and they could see that his mobility had been totally restored. The judges didn't know what to do. The people were astonished. An incredible miracle had been performed in the name of Christ. The Sanhedrin couldn't deny what had happened. It was obvious to everyone present. The Luke, the author of Acts, a physician by the way, added a very human layer to the episode, He wrote, "For the man who was miraculously healed was over forty years old" (Acts 4:22).
All the people who hung out at the market area surrounding Solomon's Colonnade knew the man, his family, and his circumstances. The mention of this age serves two purposes: to prove the authenticity of the miracle, and, to insure that what happened wasn't a well-orchestrated hoax. You see, a man of forty years possesses the influence of a known reputation. He was credible, established---old enough to be taken seriously. Forty should be the milestone age of seriousness. It doesn't mean that you can have fun, laugh a lot, squeeze every drop of joy out of life, and prepare for the second childhood they say comes in the next chapter of life. But, by this time, our word should be worth something, our name and and character should be established. People should take us seriously.
Churches too. Ours is forty this year. 1970-2010 could be a grave marker etching. For many it is. Some congregations possess absolutely no community influence. At forty they are typically suffering from old age or have been stunted in their spiritual development, acting like kiddies. Younger Americans yawn at these light-weight churches who will not act their age. They should grow up.
You see, by age forty there should be credibility---individuals, businesses, relationships, and churches. It is an element of maturity. And, that's the hair-ball. Impact happens when maturity defines the day. The rest is just child's play---baby pool, shallow end, changing table, high chair, pablum.
Credibility: adults only.