I believe that my step daughter is old enough to sleep alone. She's 4 yrs old and I have told my man that the little girls should NOT sleep in our bed as this is our space. I just believe that couples should have some alone time especially when it's time for bed. We have talked to her about sleeping in her own bed and the last couple nights she has been in our bed and it just upsets me that we discussed that no kids sleep with us. she knows how to butter him up and everything we have decided is dismissed n she continues to sleep with us because he allows her to.