At how many months(age) did you stop rear-facing your baby’s car seat

Luna

My son is 20 months and wondering if I should wait till 2 years

**for the people saying 3+ years. Can I ask if you had any problems with the child getting comfortable in it at that again? Just curious. I had to buy a bigger car seat because the last one my son barely had any leg room and I could tell he was extremely uncomfortable... he fits better in his current car seat but just wondering what obstacles you face waiting till after 3+ years