I certainly don't mean to oversimplify this because I do understand life's demands. I also understand that there are "needy" people and we must be discerning in those particular situations. At the same time, when we accepted Christ and asked him to be Lord of our lives, we made an exchange from living for ourselves to living for God and his glory, which in turn means laying down our lives and our desires for the sake of the gospel and for the sake of God's people. As a Christian, my life is no longer my own. God has work for me to do and that work is not passively showing up to church on Sunday mornings—it requires active engagement in my daily life. I must commit to binding my life to others in compassion and love. Mentoring is a lifelong commitment to this cause.
Diversity and Blessing the Generations
Mentoring stretches us and makes us uncomfortable. Humans are creatures of habit and given our choice, we will do what is most comfortable for us every time. People will regularly gravitate to those with whom they already have something in common. So the moms will hang out with other moms (and the Mothers of Preschoolers get their own special group), young professionals hang out with other young professionals, the widows are over here, single folks are over there, college students in the gym, the elderly…well, you get the picture. In short, the entire church is segregated. That's quite natural behavior. We need to understand, however, that if we are in a church which operates in this manner, we must be more intentional about discipling (across generations from the biblical model as presented above) and building relationships at other opportunities outside of Sunday morning.
Titus 2 communicates the responsibility older and wiser men and women have to teach and train the younger men and women. The Israelites were disobedient and regularly chastised for failing to teach their children as God required (for example, see Deuteronomy 4:2-10). God is a God of generations. Throughout the Bible, God refers to himself as "the God of Abraham, the God of Isaac, and the God of Jacob (Exodus 3:6 and Matthew 22:32)." The writers of the Psalms clearly discussed the blessings that follow those to teach across generations.