My dog is nine years old and never had seizes until today what wrong with him

It is best to get him to the vet for proper diagnosis.
If you have video on your cell phone and can record one of the seizures it would be helpful to your vet to see the actual seizure, how long it lasts, and how he reacts post seizure.
In the meantime, try to keep him as quiet as possible and try to reduce the stimulation around him, meaning- not dark, but dimly lit rooms, lessen the noise and activity he is exposed to.
These things won't stop seizures, you still need to get him to the vet.

Some people can mistake seizures for syncopal episodes, how does he act after the episode?
Typically after a seizure the animal will appear disoriented, and may actually seem blind, it can last for minutes to hours.
Is this what you are noticing afterwards?

At any rate if these are true seizures remember to keep yourself and your family safe during the time that it is happening.
Pull furniture away if you need, toss some cushions and blankets down to pad him.
But stay safe, the jaws can snap during this and you could be injured, be careful during the post seizure period also, if disoriented he may not recognize you right off, of course he wouldn't bite on purpose, but in a stupor he may.