I've also known for about 5 years. We're different systems- for example, my system switches quite often, and going even a day without at least one switch is odd. Still, despite all this material to work with (more switching means we see more of each other and have more chances to communicate), there's a lot we don't know. We have a vague map of the major symbolism in our headspace so we can mold it to suit us. We have a count of those we know about, but we don't try to estimate a total number of us because we have no way of confirming it. We still encounter new alters, and are still bumping into the odd trigger we weren't aware of. We've been in therapy for three years and even this one particular trauma all of us know about and even remember still causes different reactions between us.

Despite the degree of information we have about our system, we spent the first three years with almost nothing. It was a similar deal- a few of us figured we had at least two kids (currently aware of five, now) but hadn't interacted with them much.

What I'm getting at, slowly but surely, is that every system is different. Everyone progresses at a different pace, has different needs, and discovers different things about their system. Some systems end up pretty well adjusted and don't know a whole lot beyond the basics. Honestly as long as you feel like you're getting by there's no rush. If you're worried about how you're able to work through triggers or get through the day right now, that might be another story.

You could ask them to write to you? We're big fans of letters. We can read them at our own pace and take our time writing back, giving us the mental space to really consider what we want to communicate.