No childhood abuse.
All of it, or mostly anyway, as I'm not eidetic... From about age 2 onward. A few scattered memories before that.
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In the US the average age to start remembering things linearly has been age 5 for the past few generations // aka when life takes a major change for the first time (kindergarten). Now that most kids are in preschool / daycare? Those numbers will probably shift around some... As the average age people start remembering changes by location/culture... And is strongly correlated to both major change -like starting school- & memory refreshing / people actively reminding you of past events, like the way kindergarten is referenced consistently throughout grade school years by teachers and classmates. In countries where the average age is 4/5/6/7? That's usually also the year schooling becomes compulsory. Military families, meanwhile, who move countries every 1-2 years the average age is 2 or 3.
Memory is a very fluid thing. There isn't a "normal", exactly, more like trends. Not remembering your childhood at all? Is usually indicative of major trauma OR major change that becomes static. Like moving countries, or major climates, once. Everything that doesn't fit with the "now" (Japan vs Spain, or tropical to glacial), tends to fade away for most people and become hazy / surreal / unreal / forgotten... Unless there are a lot of regular reminders. But people who keep moving tend to compartmentalize memories, instead of losing the ones that don't make sense in the current context. This happened there, that happened then, etc.
