Each age has skills that they need to learn. While they might enjoy the paint, etc. they also need to be using the toys that will teach them the fine motor skills for doing crafts.

I guess too it depends on what we are talking about when we say one year olds - 12 -15 month olds and 20-23 months olds are all one year olds.

I just see too many people trying to make the babies - under 18-20 months tag along with the big kids instead of getting to do the learning that is important to them.