As an older sister you're quite a bit to live up to

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  • Enquiring Mind

    Senior Member
    English - the Queen's
    14. live up to,
    [~ + up + to + object] to behave so as to satisfy or represent (ideals, standards, etc.)
    living up to the high standards of his father. (WR)
    In your context, you are my older sister and it is quite difficult (= you're quite a bit) for me to match/equal your standards/qualities.
    In other words, you, as my older sister, are a good and quite difficult role model for me to emulate. She is complimenting her elder sister on being a good but difficult example for her to follow. The fact that the elder sister has "a couple of chinks in [her] armour" (= shortcomings or weaknesses) makes the task of living up to her slightly easier for the younger sister.
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