How do you act like an old person or senior citizen on stage or on camera?

I would say just put on a gray wig, unstraighten your back, use a cane from a elderly person like your grandmother's cane or something, then pretend to have an elderly voice like this, "(Elderly Voice) Hello sonny, can you help me take this to my home (boy nods), (old lady speaking), Okay. well............. *cough cough*, okay. please help me ow, i feel like I am going to fall." So, this is how. Hope this helped. ;) :).