I do remember what I used to do before my brother was born so probably age 3-4. I can remember showering with my mom and barely being above her thigh in height so yeah 4 years old sound about right. My mom worked and my dad was going to school so I'd play by myself a lot so I feel entertaining yourself and not relying on someone being the "fun maker" causes me to remember a lot. I can even remember my dreams :/