"Let no man despise thy youth; but be thou an example of the believers, in word, in conversation, in charity, in spirit, in faith, impurity. Till I come, give attendance to reading, to exhortation, to doctrine. Neglect not the gift that is in thee, which was given thee by prophecy, with the laying on of the hands of the presbytery. Meditate upon these things; give thyself wholly to them; that thy profiting may appear to all. Take heed unto thyself, and unto the doctrine; continue in them: for in doing this thou shalt both save thyself, and them that hear thee." 1 Tim. 4:12-16.
First, like with marriage, can anyone truly be prepared for a pastorate except the Lord has called them. Most seminarians who went there straight from college will say that they learnt more in their first pastorate than they learn in school. Even preacher's kids that become pastors realize they didn't know what their parents went through.
Second, a pastoral counselor does not call people to themselves. We call them to sound doctrine from the scripture. Not our stories and life experience but scriptural teaching. Counseling is not about us.
Thirdly, I guess 1 Tim. 3:4-5 in light of some interpretations would ban any man from pastoring that could not have kids, even though they are married.