I remember my first time in a lounge. Believe it or not it was the KL lounge in GLA, when I was 9 years old! My next 'proper' lounge visit was one of the KL Crown Lounges in AMS (can't remember which one as there used to be loads of them!). I used these lounges for a number of years on my bi-annual BKK runs (and the lounge at BKK itself).
My first visit to the BA lounges was probably probably about 10 years ago - the GLA lounge was first then the T1 lounge (I think - wasn't an avid FTer at that point so did not make notes on my visits)
Now, as many are aware, I have been using the T5 North/South, T1 BD and LGW lounges about 3 or 4 times per week