Is it important that Christians know when they first said 'Yes' to God's love and forgiveness?

Sometimes it is difficult for people to know when they became a Christian especially if they were very young at the time.

 
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However many Christians believe it is more important that they know they are a Christian than when they became a Christian. In fact the Bible teaches that being a Christian  isn’t about a person saying ‘Yes’ to God’s love and forgiveness one day and then forgetting about him for the rest of their life. The Bible teaches that being a Christian is about being close friends with God day after day; it's about saying ‘Yes’ to God's love and forgiveness day after day after day; it's about trusting in him and, with the powerful help of the Holy Spirit, learning and growing to live his way.