Originally Posted by
PACOX
I'm prepared to be wrong but I'm a bit more convinced that he's a born and bred Mando after the hot takes cooled off a bit.
The Mandalorians were a neutral planet/state during the Clone Wars, they weren't really messing with anyone but themselves. About halfway through the war, Palpatine had the Separatist attack Mandalore to push them towards the Republic. During that time period, enough Mandalorians were killed that the Death Watch was formed to push the Mandalorians back to their militaristic ways. So its safe to assume there were plenty of orphaned Mandalorian children. Correct me I'm wrong but I don't remember there much about Mandalore taking in refugees (who weren't their own). They certainly weren't taking in outsiders post-Dutchess Satine and the 20 year period where they were definitely a vassal of the Empire. I haven't seen anything that says 'foundlings' are outsiders (I know the old canon).
I would say Mando is somewhere in his 30s/40s. Lets say he is 40. ANH happened ~years before the show, so he'd be 30. The time between ANH and RotS is ~20 years, so he'd be 10 at the end of RotS. The Clone Wars lasted 3-4 years, Mandalore was attacked and 'forced' into the conflict a little past the halfway point, so take ~2 years off his age. He would've been ~7-8 in his flashbacks, which seems about right, so it the timeline adds up IF he was orphaned during that time period.
I'm thirst for any Mandalorian lore whereever they take it though. Those were favorite arcs in TCW and Rebels series.