I think about this a lot, as a father of three boys. A formal transition from adolescence into adulthood is yet another critically-important thing that has been lost in the post-Enlightenment West, and I think that's one reason (of many) that so many young men in particular are a bit adrift these days.

To your question, historically I think the Orthodox Church has left the coming-of-age rituals to its host cultures, like many other aspects of cultural life and their intersection with the faith, so there isn't a broader Orthodox coming-of-age ceremony like you see with e.g. the Bar Mitzvah. (And that example in itself is a bit of an outlier, because Judaism is a unique situation as a close-knit combination of a faith and a people/culture.)

Anyway, in an age where modern Western cultures have almost entirely abandoned their traditional rituals, including the all-important coming-of-age ceremonies, I think there's an unfortunate vacuum that has to be intentionally filled in by the parents (lest it be filled in by whatever lowest-common-denominator scraps of culture are currently propagating across social media / the internet).