bunkbeds

so I have a 6 yrs old, 4yr old, then the 4 month old. now by the time the youngest is in his own room they will be 7 and 5.I dont trust my middle child as he is super hyper and gets into everything and does everything hes not suppose to. so i dont want them to share a room. we have a 3 bedroom townhouse and dont plan on moving until we buy a house. do you think its ok if the two oldest share a room with bunkbeds or w.e til the boys are older. the 6 year old is a girl and the youngest two are boys.