No not usually, but as they get a bit older they can lose interest in doing somethings that you use to do with him/her. Or they could be just unwilling to perform the action that you wanted them to do.
They are not the smartest animals in the world so remember not to expect too much from them or there brains.
No
You can lose your memory from becoming old or from losing to much white brain cells.
Uhm...no
No
No.
Their memory.
YES
Yes, this can happen.
People start to lose their memory when they get old like 50 years old, and that is called old-timer's disease.
If you have panadol when your not supposed to or you have too much you can lose your memory.
Like if you intruduce a baby gerbil to a female and a male gerbil they might be nice to him but the male gerbil might play fight or fight in the cage i do not think if you leave the baby gerbil in the same cage with the male gerbil or a female gerbil the female gerbil migt fight or play fight with the baby gerbil if u do please be real care full because if the male gerbil no that the babby gerbil if its a baby girl gerbil yhey will mate or if u do the same with the adult female gerbil they mate to with a baby boy gerbil or adult gerbil will mate to and also mate means that the female gerbil have babbies with the male gerbils .
I would get your gerbil checked out by the veterinarian, it might have mites, or an irritation to something in its cage.