Enos is hunting alone. This suggests that he was considered experienced enough to hunt without a companion. We may consider him of an age to be reflective, but guesses at age are difficult as it is very likely that a youth in this society would have more rapidly passed into early adulthood than his modern counterpart. We may suggest that Enos was no younger than perhaps early to mid-teens when he has this experience, but there is nothing to preclude him being older than that. It is rather certain at this point, however, that Jacob is deceased, and that these remembrances of teachings are coming from past experiences, not present. Jacob's words have taken time to work into Enos' heart, and situation that many modern parents can understand, and perhaps take comfort in the eventual effectiveness of parental teaching and testimony.
Enos tells us explicitly that he has learned of the Lord from his father. For some reason, at this particular time those teachings become pressing, and Enos feels the need to have a personal experience of those things he has heard from his father.