にして
(Ni shi te)
at (the point of) / being (X), (emphatic).
Connection rules
- +Noun + にして. Typically with age, position, or identity nouns.
- +Age emphasis: 80歳にして ('at 80 years old', emphasizing the age as notable).
- +Dual-identity sense: 医者にして作家 ('a doctor who is also a writer').
Examples
1.
彼は80歳にして、今も元気だ。

Kare wa 80 sai ni shi te, ima mo genki da.
At 80 years old, he is still energetic.
「at (the point of) / being (X), (emphatic)」
2.
今にして思えば、あれが最後のチャンスだった。

Ima ni shi te omoe ba, are ga saigo no chansu da ta.
Now that I think about it, that was my last chance.
「at (the point of) / being (X), (emphatic)」
Practice
He started his own business at the age of 40.
彼は___、自分の会社を立ち上げた。
Romaji also accepted