Russell Moore has some helpful words here. As Christians, we often emphasize the date of a dramatic conversion experience. Others (including our children) who do not have a dramatic experience may worry. After relaying his story, Moore says this:

The reason I write this is because my story isn’t at all typical of most Christians I know, and many kind of feel guilty about that. Many believe if they really have embraced the gospel, they ought to have a moment, a date, they can point to as the instant they passed from the kingdom of darkness to the kingdom of light.

And

The same is true for the gospel. Some of you were brought to Christ suddenly and dramatically. Your past life as a prostitute or a drunk or a warlord gave way to a radically different direction as a disciple. In that, your situation is quite similar to the Apostle Paul’s. Others of you, though saved just as truly in some point in time, aren’t able to identify that time. Your memory is of a slow realization of the gospel, and you can’t necessarily pinpoint when you were converted in that time-frame. Your situation sounds more like that of Paul’s disciple Timothy. The point of the gospel isn’t celebrating an experience; it’s believing a Man who is your crucified, resurrected, reigning Life.

Read the whole thing.