네가 20대 인 줄 아니?

A: My energy is spent. I got home when the rooster crowed.
B: I don’t know how you do it. It’s too much for me.
A: Staying up all night is easier than waking up early.
B: 네가 20대 인 줄 아니? You’d better slow down.

A: 내 에너지가 완전 바닥났어. 동틀 때 집에 들어갔어.
B: 난 네가 어떻게 그러는 지 모르겠다. 난 그렇게는 못 해.
A: 밤을 새우는 게 일찍 일어나는 것보다 훨씬 쉬워.
B: You’re no spring chicken. 살살해.

[Additional expressions]
*My energy is spent.
– I have no more energy. / I’m exhausted. / I’m all out of energy.
*I got home when the rooster crowed.
– I arrived back at my house at dawn. / I went home early in the morning.
*I don’t know how you do it.
– I can’t understand how you are able to do that. / I can’t figure you out.
*It’s too much for me.
– That’s more than I can handle. / That’s way beyond my ability.
*Staying up all night
– Keeping awake all night long / Not sleeping at all at night
*is easier than waking up early
– is easy compared to trying to awaken early in the morning
*You’re no spring chicken.
– You’re not so young any more. / You’re getting older.
*You’d better slow down.
– You should take it easy. / You ought not be doing that so much any more.