孩子已经老大不小了,家长不该继续替他承担所有后果。Háizi yǐjīng lǎodà bù xiǎo le, jiāzhǎng bù gāi jìxù tì tā chéngdān suǒyǒu hòuguǒ.The child is already old enough; the parents should not continue bearing all the consequences for him.
他老大不高兴,一句话也不说。Tā lǎodà bù gāoxìng, yí jù huà yě bù shuō.He was very displeased and didn't say a word.
你都老大不小了,该自己做决定了。Nǐ dōu lǎodà bù xiǎo le, gāi zìjǐ zuò juédìng le.You're no longer young; it's time to make your own decisions.