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I wouldn’t expect to see signs of old age if she’s only around a year.
What’s the weather like where you are? Sometimes they can be a lot less active if it’s quite hot in summer or if it gets too cold in winter.
They can just go through phases when they’re more or less active too, often more active when everything is new to them then their behaviour may change a b it depending on the individual ham.
If she seems fine in herself, eat & drinks ok & nothing is obviously wrong I wouldn’t worry too much, just keep an eye on her & continue with health checks as usual for now.