At the same age, around 12 or so, I was holding it for 3'35" under water. I was more or less serious with that, I mean, I did not do that stupidely at first attempt. I had been timing myself for a long months (years ?). In the beginning, holding 1'30 was difficult. So it took me several months to learn how to stay calm, to look after my heart beat while trying to minimize my entire body activity.
Now what is funny, is that I was not really doing this for any other purpose than amateur free diving in natural environment. I was among other sports a swimmer, a cross-country skier (winter) and cycler (summer), plus living in altitude also develops lungs naturally. And only years later did I read about people doing that seriously and found out that, the methods I came up with intuitively were used by professionals.
Don't try this at home ! ;-)
edit
Unfortunately, I have not been practicing for a looooong time, and I guess I cannot exceed 3' now. So I voted 2' to 3'.