回答
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My memory is not as good as before. I really feel my age!
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My memory is not as good as it used to be and it's making me feel old.
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I feel old when I forget things so often.
「何だか覚えが悪くなって年を感じる~・・」= My memory is not as good as before. I really feel my age! / My memory is not as good as it used to be and it's making me feel old. / I feel old when I forget things so often.
ボキャブラリー
覚えが(前・昔より)悪い・記憶力が悪い = my memory is not as good as before / my memory is not as good as it used to be / I often forget things
年を感じる = I feel my age / I feel old