I am not sure what exactly you mean by moaning, but older cats often develope the habit of sort of this loud plaintive meowing. Some experts think it is senility and some think that the cat is going deaf and is trying to orient herself by meowing loudly and seeing where the sound echoes.

If your cat has not had her kidney function checked, I recommend that at a minimum. Probably a full blood work up would be best. At 16 these should be routine for a "senior" exam anyhow. She could be developing early kidney failure and would benefit from early detection and treatment.
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Smile, it will make them wonder what you are up to!

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