He became a taciturn man, a man not easy to live with. Later, when the older children married and had children of their own, he mellowed a little.

他变成了一个沉默寡言的人、一个不容易相处的人。后来，等大点的孩子们结了婚，也有了他们自己的孩子，他变得平和了些。

《柯林斯英汉双解大词典》

If he mellowed out, maybe he could someday have a family.

NEWYORKER: Puppy

Though Tony will still speak his mind, he has mellowed over the years.

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And, you know, I don't - I think he's actually mellowed out considerably over the years.

NPR: McCain Keeps Home Fires Burning