developmental age

I was wondering when a person on the spectrum their  developmental age is described as lower than their chronological age, is this just because of them being on the spectrum or is this usually because of also having a learning or intellectual disability? 

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  • I was ALWAYS immature

    haha, it seems it's autistic trait as well

    when I was 18, during last year at Liceum (High School equivalent), shortly before sitting Matura (A-levels) I was busy translating rulebooks for Warhammer Battle, and I was doing it during classes instead of attending, it annoyed my math teacher, and she asked me a question, I think now it was rethorical:

    ''How old are you''

    I answered using poem for kids:

    ''Mam 6 latek, 6 i pol....'' 

    it means:

    ''I'm 6, six and a half...''

    :D