Do you write down the exact day that your pubes start growing or what?! I hope that you don't do this: "Dear diary, I just grew my first pubic hair near my balls".
It's pretty easy to remember what age you were when you first started getting taller, or your voice got deeper or you did grow hairs.
The fact that someone could have no idea about when they were in puberty is even more bizarre.
It's like saying you had absolutely no awareness of your entire body during your most rapid stage of growth.
I'm thinking I started at maybe age 11, but can't be sure.
I definitely had hair and a deeper voice by 12-13.
But it's a bit hard to define a cut-off point, since puberty keeps going on for years while your muscles and bones change shape.
It's quite possible that I'm not even fully out of puberty at 18.
Male growth tends to stop entirely at age 21 anyway.