Hmm... V4 Tama characters should be at least 2 years old before evolving into adults. You probably have a glitch. And when you said that your Tama can't use some items, do you mean that it looks at the item with a question mark above its head? Those items require another certain item to use. You will need to have a mirror in your item list to be able to use make-up, and a stereo to use a CD.