HSK 7-9
老大
lǎodà形副
old age; very; eldest child in a family; leader of a group
他是家中老大，很早就担起责任。
Tā shì jiāzhōng lǎodà, hěn zǎo jiù dānqǐ zérèn.
As the eldest child, he took on responsibility at an early age.
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Appears across levels (7-9) in the HSK 3.0 word list.