Your ceremonial-grade BrewNova tin from last year? If it's been sealed tight and kept away from light and heat, it might still be fine. Matcha does fade, though. Check the color. Bright, vibrant green means it's still good. A dull, yellowish tint tells you it's past its best.

Your whisk (chasen) is another keeper if the tines are straight and it's not cracked. That bowl you use every morning? Absolutely keep it.