>>31695352she got a era 1 pokedex during her travels as a trainer, and taking in count that DPt happens roughtly 3 years after the original pokedexes where invented by Oak and assuming she started her traves at the same age (or similar) to the dex holders on gen V* (arround 15 yo) she was somewhere arround 18~21 during DPt, then add what? 2 years for BW then another 2 years for BW2 then another 2~3 for XY then a similar amount for SunMoon she must be in her late 20s~early 30s
*(Black, White, Bianca, Cheren)