I'm 36 years old. I feel like I need two days of rest after doing squats and deadlifts. Is this normal?

I don't know what it is about those two types of lifts. I usually only need one day off after other types of lifts or after pull ups. But my back and legs feel like hell the next two days after doing squats and deadlifts in the gym.
Update: Note: I only do squats and deadlifts once per week. But I have to wait two days before going back into the gym to do other types of lifts and exercises after doing them.
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