Well, Windu is dead, so…
Character:
19 + 3 + 1 + 32 = 55 years. If a human character, should have been young during ROTS; if an alien it does not really matter. Maybe a batch of clone troopers with untouched aging; the last batch of the Clone Wars having been left dormant and then forgot somewhere, like Khan and friends in the Star Trek tv series episode. I remember there was a story about that in a postlogy book. Was this in the Thrawn trilogy ?
It’s quite hard because main characters of the PT are Jedi and politicians, most of them being killed during the Empire events. Old Watto then ? The character has filled his purpose. Hum… why not a Battle Droid with free will ? Could be quite cute.
Location:
Naboo seems like a fair choice. Coruscant should eventually been seen or at least mentioned. Could also be fun to see more of Kashyyyk (technically it first appeared in TSWHS).