Answer:
Use me if you really want to see inside someone
my rings are not worth much but they do tell my age.
Where did the baseball keep its lemonade?
I am so delicious that I require a house to contain me.
I can be simple or I can be complex. I can be found in this riddle or in everyday life. I can be shapes or even colors.
No matter how little or how much you use me, you change me every month.