Forward Facing Carseat

Okay, Okay, Okay. I know this can be a controversial topic depending on who you talk to, but im curious what others may say.

I have 4 kids. My youngest is turning 1 in a couple of days. My oldest is 10, and I remember being told (by the dr) that we could forward face him at 1yrs old, which we did. He wasnt a big fan of his car seat, and would scream. We turned him around, and never had that issue again. Well, fast forward to today, my youngest is the same way. We already bought her new car seat, but her dr mentioned waiting till 2yrs old now.

I know there are people who keep there kid rear facing until they are 4-5 yrs old, but what age did you turn your little around?