Final answer:
The statement is generally true. According to the rule against perpetuities in law, an interest that potentially might vest over 21 years after a life in being at the creation of the interest is considered invalid.
Step-by-step explanation:
In the context of law, the statement is generally true. The "rule against perpetuities" is a legal doctrine that limits the duration of certain property interests. Under this rule, an interest that potentially might vest over 21 years after a life in being at the creation of the interest is considered invalid.
For example, if a person creates a trust stating that their grandchildren will inherit the property 50 years after the death of the last living grandchild, this would violate the rule against perpetuities because it extends past the 21-year limit.
However, it's important to note that the rule against perpetuities can vary in different jurisdictions, so it's always advisable to consult local laws and legal professionals for precise information.