Husband keeps saying that we go to bed early because we are "old"

I mean we are "old" but that's not why. I am just fucking worn out and defeated by the time I finally get my AuDHD son in bed. During the day its random meltdowns that drain me one by one. And then the long ass process it takes to actually get him in bed and it seems to take longer with more arguments as time goes on . And even then I can't do anything more involved than mindlessly doom scroll because he'll be out of bed every ten minutes with one complaint or other. And then he'll be up no later than 6 or 7 the next morning to do it all again. So it drives me nuts when husband says "oh we're old because we go to bed so early". Speak for yourself. I'm just so fucking burned out and depressed that I crash after getting son into bed but stay up on my phone until midnight most of the time.