What time do you put elementary school students to bed?

What time do elementary school students go to bed?

I always put the older child to bed between 8:30 and 9:00.

But since the older child is a middle school student

They come back from the academy as early as 9 o'clock or as late as past 10 o'clock.

So, the younger siblings are not sleeping~~

I can't sleep even if I try.

Elementary school students have a hard time every morning.

I was just talking and catching up when my sister came over.

I usually go to bed after 10 o'clock on average, and if I stay up late, I go to bed around midnight.

Even if I tell it to grow quickly, it doesn't listen.

Is there a good way?