Life span decreased by 10 years.
At the end of S5, I thought maybe that Clarke and Madi might've found other nightbloods since Clarke's "We tried to dig them out" didn't make clear whether it was just her and Madi or others. but the size reel seems to say that it's just been the 2 of them for 6 years, right? Also, I don't get C's mentality of "we'll kill them all". I thought S4 was largely her learning that everyone is important and deserves to survive?? so why would she say this w/o even knowing who the miners are?