I saw a bunch of workbooks / worksheets at Costco the other day. I got one. It said pre-school 3-5 years old.

I started working on them with LO who is 3.25 years old. LO is grandma cared so he doesn't go to pre-school. I'm a little worried he's not learning enough during this age where he can absorb a ton of information.

He seems to like them, we have done a few pages and skip around a lot to the things he likes the most.

Do you think that's too young? When (if ever) did you start doing work books with your kids?