"Mental capacity" refers to a person's ability and strength to think, reason, understand, and make decisions about their own life and well-being. It is about how well someone's mind works and their ability to process information and make choices.
You might also consider granting someone you trust an enduring power of attorney to manage your affairs should you lose mental capacity. (moneysmart.gov.au)
It also weighs each parent's physical and mental capacity for parenting. (divorcesource.com)
Not only does physical training improve your mental state, it also increases mental capacity. (palavanfitness.com)