Writing in the Scotsman, Fiona McDonald noted that taking such a step will ensure that someone is appointed to make decisions about welfare and look after finances.
She added that it is important that such decisions are discussed with loved ones, explaining: "In the event of a serious illness or accident, when relatives' emotions are likely to be running high, it will give you and them peace of mind knowing that the right decisions are being made."
Ms McDonald also advised people to consider making a living will, which sets out what medical treatment should be taken.
These deeds have become increasingly popular, she observed, as people prefer to make decisions before illness strikes in order to take pressure off family and medical staff.
A lasting power of attorney can be made by anyone over the age of 18 but it must be registered with the Office of the Public Guardian before it has legal standing.
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