How can we help the olds whose memory are not good?

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Recently I find that my mother has some difficulty to keep thing in her mind.She always forgets what she has done and what she is ready to do.When she has finished cooking breakfast,she will suddenly say that she has forgotten to put some salt into it.When she leaves home,she will worry about the door because she thinks she might have forgotten to lock the door. I think the cause may be her age,she is more than 60 years old.The problem is, her poor memory brings some inconvience in her life.Meanwhile,I don't think my mother is not the only person who has such problems.How can we help them?