Throughout our seasons, if we have chosen to follow Christ Jesus, we will experience a "call" or time in at least one area of the Church's "five fold ministry", the simple, organic nature of the Body of Christ in the world.
If our churches are obedient, they will be training and sending us as God empowers us in these ways.
A - apostle; sent ones wherever God has us (the heart or meat of disciple making).
P - prophets; simply sharing God's Word as guided by the Spirit (often "in trouble" with the "religious")
E - evangelists; passionate proclaimers of the Gospel (in word and deed)
S - shepherds; most often the pastors of churches as Christ leads them, but others too imitating the Good Shepherd (anam cara, caring, relational)
T - teachers; expositors of the Word (also often our pastors, but all should teach, as Frank Laubach said "each one teach one".)
In our "second halves" we may find ourselves in all those roles at once, only by the Grace and strength of God.