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I; me
「私」 has other readings with different meanings.
わしにも若い頃があった。
I too had my younger days.
わしが若い頃はもっと厳しかった。
When I was young, things were much stricter.
わしの言うことを聞いておけば間違いないよ。
If you listen to what I say, you won't go wrong.