Where did my accessory go?

I bought what looked like a strawberry eye-patch from the store while my tamagotchi was a toddler. (it's the only accessory I've gotten so far) So I thought the accessory text wasn't lighting up for me because my tamagotchi was a toddler. But now that my tama is an teenager, the accessory option is still greyed out. So I am wondering where did that strawberry eye-patch thing that I paid alot for go? Since it's telling me there is still nothing in my accessories.

This is my first Tamagotchi ever, and it's the m!x Sanrio ver.

Accessories are for adult characters only.

Thank you for the answer, I wasn't aware of this. That makes more sense now. Sorry I am totally clueless about how this thing works.