Well, I didn't pick mine, which probably has something to do with it. My main age is 47, this is sort of how I feel by default, and I just sort of know it's right. It hit me, this exact number, after giving it to a character who I realized I was subconsciously representing myself through: He was me. Now, my other age, 32, has to do with the internal timeline we experience as a system, and if I remember my childhood with these memories, it happens through being 32 usually, like a proxy. As for 53 it's just because my Grandpa talked about his life at 53 and it hit me, that number fit as well. None of these would feel right if they were changed by a year, 48 is not my age, nor is 31, and certainly not 54. I just know it, I feel it like any other part of my identity, plain and simple to my own mind.