Apparently, Lotus/Suu is a girl...

what if orchid and lotus simply work, as some have suggested, as the "wonder twins" or for a more recent example, like the technician and the weapon in soul eater, alone they each have skills, but together they resonate and their power increases tenfold, while still being two separate entities.

shaman king also applies. their teamwork could also simply be very good.

as for what level the quest is, the 64 one.

I'm pretty sure good teamwork doesn't affect your physical age, but the other ideas seem plausible.
Even though I had to look up who the hell the Wonder Twins were...
Level 64? Better get to work!