My daughter is 6, but this past fall (age 5.5) we realized she was too tall for her Alpha Omega carseat, but she only weighed 36 pounds so there was no way I was putting her in a booster. I know plenty of people do it especially at 5, but I did some research and didn't feel comfortable with it. We bought the Nautilus that harnesses up to 65 pounds. She loves the carseat. I think since she only weighs 38 pounds at age 6 she'll probably go from being in a 5 point harness to a regular seat-belt. I don't know of anyone her age that is still in a 5-point harness, but I don't care. I feel she is safer and technically right now she should still be harnessed. I bought mine on sale at Target. It's a light purple and grey and I think it's a lot cooler (temp wise) than the all black one she had.