The average lifespan of a Siamese cat is around 10-15 years. While most Siamese cats live to around 10 years old, with proper care, they can live to around 15 years, and some can even reach 20 years old. Therefore, to ensure your Siamese cat stays with you for a longer period, you need to use the correct care methods. 
Methods to extend the lifespan of Siamese cats:
1. Choose the optimal time for spaying/neutering. The best time to spay/neuter a Siamese cat is when it is 6-8 months old. If you don't plan to breed your Siamese cat, it's best to have it spayed/neutered before it goes into heat. Spaying/neutering a Siamese cat can prevent reproductive diseases and extend its lifespan by 1-2 years.
2. Regular vaccinations. Siamese cats should be vaccinated against feline triple vaccine and rabies around 9-12 weeks of age. Afterward, regular vaccinations should be administered as advised by the veterinarian to ensure a healthy environment for the Siamese cat's growth.
3. Perform deworming regularly. It's essential to deworm your Siamese cat regularly. If your Siamese cat goes outdoors frequently, the deworming frequency should be shortened. It's recommended to deworm internally every 3-4 months and externally every 2-3 months.
4. Regularly help your Siamese cat expel hairballs. Although Siamese cats are short-haired, they still groom themselves frequently, which can easily lead to hairballs clogging their digestive system. To help your Siamese cat, regularly feed them cat grass or hairball remedy to gently expel hairballs.
5. Balanced nutrition. A healthy diet is crucial for extending the lifespan of a Siamese cat. You can feed them cooked meat, canned cat food, freeze-dried food, and healthy fruits and vegetables as supplementary food, and choose a nutritionally balanced cat food as their main diet.
