What is my FEI age?

I'm curious, could you please elaborate on what exactly you mean by "FEI age"? Is it a specific metric related to the FEI stablecoin or a concept entirely unrelated to cryptocurrency? If it's related to FEI, I'm not immediately familiar with a directly associated "age" concept. Perhaps you're referring to the duration since FEI's inception or the length of time you've been invested in it? Clarifying this would help me provide a more accurate response.