Care for staffys as she ages

Hello all,
I just joined. I have a female staffy called Bella who is 8 years old next week. I've had her since 8 weeks. I have been searching for tips on how to care for her as she gets older, I know 8 isn't old yet but I want to be ahead of time incase there is anything I can do now.
She normally eats chicken and rice or biscuits, with peas or carrots, or some variation of. She gets treats too, possibly too many, but she's a healthy weight. She still likes long walks although some days now she wants to stay in, I always give her the choice.
Any advice on how to give her the longest life possible would be appreciated.
TIA