Hi Brother Bill:
Brother David and Brother Sree have given some good eschatological answers, their interpretations pave the way for the 21 century Church to stay linked with what happened in the first century Church.
We are linked not because the Apostle Paul had a succession, or because Peter had a succession of men after him, we are not linked because we might imitate their services, or wear their clothing, we are not linked by way of externals or men taking up the name apostle and seek to rule the people of God.
Our link is the Holy Spirit, filling our hearts, ruling our minds and being free to command us as Jesus wills.
What do you think motivates a believer to live after the manner of the 1st century Church? Is it because of its simplicity? Maybe; is it because of its powerful testimony? Maybe; or could it be because the early Church showed powerful demonstration of supernatural power? Probably.
My observation is; men for a time seek out the things of God mentioned in Acts 2 for the above reasons, but after a while all of those reasons become disconnected from the reality of the world we live in. Each of the above reasons becomes stale and eventually cannot be sustained.
After so many Sunday's folks get used to 'hearing powerful testimonies'. Others, find the demonstration supernatural power insufficient for the difficulties of Christian life; others cannot reconcile the very busy and non-simplistic life most of us lead with anything we might imagine a 1st century believer to encounter.
Bill, none of those things aforementioned will substitute for everyday, right now presence and fellowship with Jesus Christ. All of those things are given with the intention of furthering the gospel and bringing the God's rule to bear in all things, all relationships and all circumstances of the believers life.
Why would a man want tongues? To further his own ability to increase the rule of God in himself and around him. Why would a believer want the supernatural? Because as God is placed center-stage by testimony or the gospel or acts of faith God validates his own covenant with us publically and validates his own word in the gospel. He does these things because of his love toward his own people in answering their prayers. God does it in order to demonstrate the reality of the invisible, making it visible and desirable to those who mix what they hear and see with faith.
The mistakes of Pentecostalism and Charismatic attempted to 'add-on' the elements of giftings or demonstrations of the supernatural in order to bring validation to their ministries or their Churches. But the gifts and the supernatural were never given for validation of the Church. Those things were intended to validate the love of God and mercies of God through his Church toward one another and toward the lost. The better way is faith working by love.
The mistake of the Reformed and Baptist sought to relegate those things to 'signs' necessary to validate the Church back in the 1st century. I don't see God's purpose for such demonstrations were needed back then either.
More specifically, the Holy Spirit is given for all of us to be what God has made us, to fulfill what God has called us to and to enjoy the covenant God has made with us.
As Major Ian Thomas said and I quote loosely " for each man to purpose in his heart to find out what the purpose of Christ is for him and to live out that purpose".
It is the uniting of Christ's purpose and our lives becoming one.
An eschatological title "Church age" is true, but its never been about 'knowing the age', its always been about knowing Christ and getting in line with his purpose for us individually. In the end, when we begin to see what we are, we can begin to see where we fit and how we were intended by God to build up one another and demonstrate the rule of God in this world.