The Biblical qualifications for elders come primarily from 1 Timothy 3 and Titus 1.

This saying is trustworthy: "If anyone aspires to be an overseer, he desires a noble work." An overseer, therefore, must be above reproach, the husband of one wife, self-controlled, sensible, respectable, hospitable, an able teacher, not addicted to wine, not a bully but gentle, not quarrelsome, not greedy - one who manages his own household competently, having his children under control with all dignity. (If anyone does not know how to manage his own household, how will he take care of God's church?) He must not be a new convert, or he might become conceited and fall into the condemnation of the Devil. Furthermore, he must have a good reputation among outsiders, so that he does not fall into disgrace and the Devil's trap. - 1 Timothy 3:1-7

The reason I left you in Crete was to set right what was left undone and, as I directed you, to appoint elders in every town: someone who is blameless, the husband of one wife, having faithful children not accused of wildness or rebellion. For an overseer, as God's manager, must be blameless, not arrogant, not quick tempered, not addicted to wine, not a bully, not greedy for money, but hospitable, loving what is good, sensible, righteous, holy, self-controlled, holding to the faithful message as taught, so that he will be able both to encourage with sound teaching and to refute those who contradict it. - Titus 1:5-9

From these verses we can see the qualifications of elders are:

Desire to Serve as an Elder: Elders must feel God's calling to be a Spirit-led servant leader

Above Reproach: Elders must be blameless, presenting no patterns of scriptural disobedience or grounds for accusation.

Husband of One Wife: An elder, if married, must be a devoted spouse.

Temperate: Elders must be self-controlled, enslaved to nothing, free from excesses.

Prudent: Elders must be sober, sensible, wise, balanced in judgment, not given to quick, superficial decisions based on immature thinking.

Respectable: Elders must demonstrate a well-ordered life and good behavior.

Hospitable: Elders must be unselfish with their personal resources. They must be willing to share blessings with others.

Able to Teach: Elders must be able to communicate the truth of God and exhort sound doctrine in a non-argumentative way. (2 Timothy 4:2; 2:24)

Not Addicted to Wine: Elders must be free from addictions and must be willing to limit their liberty for the sake of others.

Not Pugnacious: Elders must be gentle and characterized by forbearance and tenderness - not having a quick temper.

Uncontentious: Elders must not be given to quarreling or selfish argumentation.

Free from the Love of Money: Elders must not be stingy, greedy nor driven by monetary gain. They should not be preoccupied with amassing material things, but rather should be a model of giving.

Manage Own Household: Elders must have a well-ordered household, a healthy family life, and well-behaved children (pertains to those whose children still live under parental authority).

Not New Converts: Elders must not be new believers. They must have been Christians for long enough to demonstrate the reality of their conversion and depth of their spirituality.

Good Reputation with Outsiders: Elders must be well respected by unbelievers.

Not Self-willed: Elders must not be stubborn, insensitive or prone to force opinions on others.

Not Quick Tempered: Elders must exercise patience and selfcontrol in difficult situations.

Loves What Is Good: Elders must desire the will of God in every decision.

Just: Elders must be fair and impartial. Their judgments must be based on scriptural principles.

Devout: Elders must be reverent, continually desiring to be separated from sin. They must be devoted to prayer, the study of Scripture and the guarding of their own spiritual walk (Acts 20:28).

Holding Fast the Faithful Word: Elders must be stable in the faith, obedient to the Word of God, continually seeking to be controlled by the Holy Spirit