Oh yes familiar stories here too. My mother carried my birth certificate around when I was 3 and 4 because she certainly couldn't afford extra bus fares. I also had bad glue ear leading to speech delay and balance difficulties ... not a good combination with looking 3+ years older than I actually was. The preschool I went to often had students on placement, and apparently the staff in charge often had to race out to help me on climbing equipment as they'd tell this big girl she could do it by herself, but the regular staff knew very well I needed more help than any other child there.
A sad one. DD was just 7, DS 4 when we went to Australia Zoo in Queensland (big trip visiting grandparents for their anniversary and took some time to travel). At the entrance there was information about pony rides. All the way around DD was looking forward to that. Get there and they not only insisted that she was above their height cutoff and couldn't possibly be allowed, but also strongly suggested DS could still have a go ...
People often talk about the advantages tall kids have - well I think quite a few lack the coordination of more slowly growing children as, until they are fully grown, their body image and proprioception never manages to catch up!
My sister and I and my DS were all young in year at school and consistently treated as if we were old. Great in some out of school contexts where we thrived interacting with older children. Less good when we were only reluctantly recognised as entitled to something we were thought to be too old for. Our violin teacher always forgot we were three years younger than a pair of sisters who had lessons before ours. DS in junior years at school got short shrift at times when teachers forgot he was one of the little ones, when his admittedly immature judgement led him into trouble.
As older children we all, DD and DS as well as me and my sister, could easily pass as 16+ by 12 or 13. That can be a real mix of positive and negative.
I think being tall as a child has a permanent impact on personality. Mostly positive but watch out for them becoming too self-effacing and ensure you build their self-esteem.