There are three levels of leader development: children, youth and fathers.
Children are born from above and possess spiritual gifts. Immature children may manifest an aptitude for apostleship, prophesy, evangelism, shepherding or teaching. Let these serve in minor roles for a time, under supervision.
Youth are eager to do battle, to go to work, even to reproduce. Let them do so, not as ordained leaders, but in starting and leading new gatherings of new believers, as apprentices to a more-experienced coaches.
Fathers have manifested their ability to reproduce themselves in new believers, new disciples, and new gatherings. If these also meet the other biblical criteria, then ordain them! Put them in charge of coaching apprentices.
This biblical process may look like that of the 18th century Methodists, or it may not.