As people get older, they need brighter light to see the same things. Reading lights need to be brighter. Well-lit stairs become more important. An intercom provides added safety and a convenient way to communicate with others when it's difficult to get around. Something as simple as a peephole in the front door can be very helpful.
Burns are one of the most common injuries that older people face.
In some cases, you can eliminate the use of the stove entirely for heating water. There are hot water dispensers that can be set up like another faucet in your sink. These are very convenient. Scalding hot water also causes many injuries in the bathroom. It's not unusual for someone to fall in the shower or tub, hitting the faucet on the way down.