I'm not sure what you mean by "older", but I'm going to assume you mean not in your 20's...lol. Regardless of age, keeping your romantic life on fire is all about communicating with your partner. Discussing your desires, your favorite position, or even fantasies can help a couple learn and adjust to each other's needs. As we mature, our sexual desires may change, but they do not die! Sometimes, due to health issues or decreased mobility, we have to learn new ways to please our partners and ourselves. Even if you feel like you've "done everything", there are always new ways to spice things up. There are great products available for everything from massage, to increased libido, to male prolonging cream, to bedroom toys. There is always research being done to find products for every type of couple. I highly recommend a company called Pure Romance, which sells a large variety of products to help couples keep the fire alive.
I hope this answered your question. Thanks for your interest! Keep following me, as I will be covering lots of great and useful topics in the future!