What was his old mix hun?
I'm not sure if it works for an elderly hamster but my Syrian is on Harry Hamster, Supreme Science Selective Hamster and Versele Laga Crispy Muesli all mixed together. Harry Hamster and Supreme Selective are both fine on their own as are a lot of other mixes so it's a case of finding a good one that works for you and your hammie or doing what I've done and mixing a few together
