My mom could never beat me up if she wanted to. She contracted rhumitord arthritis around her early 20's, now she's got it so bad she might die if her neck is turned a certain way (neck joints got crippled--they could pierce her brain because they're out of place.) Right now she's 54.
I feel bad that you got your ass kicked by your mom.. I'd never hit my mom back (if she could kick my ass) because my dad may kill me.