Trust me, the brownie is FINE!
My friend kept a stone hard brownie his sis gave him from LOOOONG ago.
Almost a year maybe.
It was still tasty but hard as a rock.
Got me higher than I've ever been in my life.
It was like shrooms.
I even said to my friend at the peak of my high: "uh, duuude... i dunno if i can handle this..?!"

Have fun.