Around what age did you switch your baby to their own nursery? My almost 3 year old and my youngest…

Around what age did you switch your baby to their own nursery? My almost 3 year old and my youngest will be sharing the master bedroom. I have a video baby monitor and our rooms are back to back of each other. My LO will be 5 months old in a few days. I can’t remember how old my oldest was when I switched her to her crib in her own bedroom but I feel like it was around this time. She sleeps through the night some nights, and some nights she’ll wake up once to eat.