Firstly, whether you identify with an age or not is personal decision (or just 'is' for some) and neither choice is a wrong one. Having a specific little age can quickly communicate your preferences, provide a goal to shoot for, or just simply be more fun. It is not like we are beholden to be truly accurate and represent that age faithfully, if that is even a thing since everyone is different regardless of their age.
I prescribe to a more broad label, to just embody the concept of baby. To mix elements like bottles and high chairs, with video games and coloring. For specific ages are more of a scene. Like for this period of time, I will be treated as if I am two with no exceptions. Day-to-day life and the dynamic is more generalized, with little facets of babyhood and even childhood threaded into my life, just enough to feel smol or enough to entirely dominate me. It just depends.