Hey, so I think I’m giving my cats improper care (I just didn’t ever think of it since I’ve grown up caring for them like this)
Here are my questions:
Is blue buffalo food ok for them?
do they need certain toys to play with? My cats are 7 and 14 so they don’t like to play with kitten toys but any type of enrichment?
Anything else I should know?
Here’s my care basically:
Blue buffalo food always available
water also always available
they free roam
I pet them and give them attention like all day long
I give them treats and catnip sometimes
is this good??
From what you said, your care actually sounds pretty good!
Blue Buffalo is (I think) a good brand of dried cat food, but I'd try supplementing it w/ some meat and wet cat food occasionally. And yeah, ofc treats are always a good thing! 
That's great that they get lots of attention! Cats act like they would die without it, lol.
I do have a few questions: 1. how much exercise do they get? Are they allowed outside (on the porch or in your yard) ever? Do they have a lot of space if they are indoor-only cats? If not, I'd suggest buying or making some toys that they can chase, so they can have a proper amount of exercise. 
2. Do they have a scratching post or something they can use to scratch and sharpen their claws? If not, it would be a good idea to buy (or DIY) one!
For toys or enrichment, I find that cats like the simplest things to play w/: cardboard boxes, empty grocery bags, ping pong balls, pieces of string, corrugated cardboard (to scratch their claws on) etc...ofc you can always go out and buy cat toys, but these are just some things you might be able to find around your house.
I hope this helps you! 
Edited by ~Bumble~, 25 April 2021 - 07:16 AM.