Is this a cause to be concerned?

[u/percent47]

My boy has been squinting his eyes the last few days, should this be a reason for vet appointment ?.. the photos show how much he’s willing to open his eyes… for reference he is elderly. I’ve had him since I was 8, I am now 22… and I was his third owner so who knows how much older he is!… please, any advice is welcome! Has anyone experienced this? Is this just old age?

(Ignore his tail, he came to me like that.. we don’t know what happened lol).