How can the rest of the main six expect Twilight die?

I get that they’re not immortal like Twi but they shouldn’t be able to die of old age since there are so so many ways to gain immortality that there’s a whole secret society of immortal ponies like Daring Do for example

Wanna know how she gained immortality… a flower, a fucking flower in the middle of a jungle

The only reason they’d not want to be immortal together forever is because they want to drown in the flow of time instead of getting on the boat that is immortality

Also Discord could just make them immortal, and don’t say *“erm acktually he can’t grant people immortality because erm… reasons 🤓☝️” *

because if he can revive ancient beings from the dead, immortality should be considered child’s play by his standards, he’s the closest thing the verse has to a god