I don't know if there are statistics on this, or if the answer depends on the denomination, but are Christians usually consciously aware of the first time they received the Holy Spirit? Is the reception of the Holy Spirit for the first time an unmistakable, life-changing, self-evident experience/event that most Christians can easily remember, the date of which they can easily pinpoint on a calendar?
Relevant passage:
Now it happened that while Apollos was in Corinth, Paul passed through the upper country and came to Ephesus, and found some disciples. 2 He said to them, “Did you receive the Holy Spirit when you believed?” And they said to him, “On the contrary, we have not even heard if there is a Holy Spirit.” 3 And he said, “Into what then were you baptized?” And they said, “Into John’s baptism.” 4 Paul said, “John baptized with a baptism of repentance, telling the people to believe in Him who was coming after him, that is, in Jesus.” 5 When they heard this, they were baptized in the name of the Lord Jesus. 6 And when Paul had laid hands upon them, the Holy Spirit came on them and they began speaking with tongues and prophesying. 7 There were about twelve men in all. (Acts 19:1-6 NASB)
Relevant passage:
Now it happened that while Apollos was in Corinth, Paul passed through the upper country and came to Ephesus, and found some disciples. 2 He said to them, “Did you receive the Holy Spirit when you believed?” And they said to him, “On the contrary, we have not even heard if there is a Holy Spirit.” 3 And he said, “Into what then were you baptized?” And they said, “Into John’s baptism.” 4 Paul said, “John baptized with a baptism of repentance, telling the people to believe in Him who was coming after him, that is, in Jesus.” 5 When they heard this, they were baptized in the name of the Lord Jesus. 6 And when Paul had laid hands upon them, the Holy Spirit came on them and they began speaking with tongues and prophesying. 7 There were about twelve men in all. (Acts 19:1-6 NASB)