Oldest Age To Spay A Cat. The risks involved with surgery grow as an animal ages, and 6 years old is about the age to exercise more caution. There isn't really an age limit for a cat to be spayed or neutered.
In an effort to avoid the start of urine spraying and eliminate the chance for pregnancy, it’s advisable to schedule the surgery before your own cat reaches five months of age. Most pets become less aggressive toward people and other animals. Giant breeds of rabbits may reach maturity a couple of months later, so the surgery might be done a little later in these breeds if necessary.
That simply means that it is best when they are 6.
If some of the residents seem older than 10+, they may need a blood panel to determine if they can handle going under anesthesia. But older cats generally handle the procedure fine. At what age should i spay/neuter my dog or cat? If you contact a local tnr (trap, neuter, release) group they may spay and neuter all the strays for free or reduced cost.