Three for us, but it's totally hormonal and nothing you can control. So I really wouldn't worry about it!
My little boy is 4 and is inconsistently dry so we use pull ups. His cousin was 5 years 11 months, but apparently I was 2. It will happen when it happens!
He started 3yr old kinder fully trained, trained at 2y3m. My girls were actually earlier than him
When he was 2 - we were very surprised but he just stopped wetting soon after we potty trained him. He’s 2.5 now and hasn’t wet overnight in months