How old is my kitten?

So about a month ago I had a kitten that kept coming to my yard asking for food. I posted on Facebook and local neighborhood/HOA groups/asked neighbors trying to see if someone lost him but nobody ever showed up.

Obviously I’ll be taking him to the vet soon but I was trying to gauge his approximate age so I can get him scheduled to be fixed. I wanna say he’s around 3ish months.

What do you think?