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Well, staying on the market for a long time/until you're old is very rare on both markets. Madonna is unique.
Ayumi is pretty unique, on the Japanese market ... she's been around for a long time and I'm pretty sure she could be around forever if she wanted to go for it, her sales would decline, but she'd still be popular enough to live on her music.
To stay popular when you grow old, or for a long time, is rare on any given market.
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