Can Prince George Become King as a Child? The Regency Explained
If the crown passed to Prince George before he turned 18, he would still become King. Here is exactly how a royal regency would work.
Prince George is, at the time of writing, a schoolboy who is also third in line to the British throne, a genuinely strange combination that raises a question people ask more often than you might expect: what would actually happen if he inherited the crown before he was old enough to drive?
The short answer is that he would become King regardless of his age. The British monarchy has never required an heir to reach a particular age before inheriting; the crown passes the instant the previous monarch dies, no matter who is next in line. What changes is not whether George becomes King, but who actually exercises the powers of the crown while he grows up.
The mechanism is called a regency
Britain has a specific, long-established legal answer for exactly this situation: the Regency Act 1937, later amended, which sets out what happens if the monarch is either under 18 or incapable of performing royal duties. Under the Act, a Regent is appointed to carry out the sovereign’s constitutional functions, opening Parliament, granting royal assent to legislation, receiving ambassadors, on the young monarch’s behalf until he turns 18 and can reign in his own right.
Who the Act names as Regent
The Regency Act does not leave the choice open to debate or personal preference; it sets out a clear order based on the line of succession itself. The role generally falls to the person who is next in line to the throne after the young monarch, provided that person is a British citizen resident in the UK and at least 21 years old (or 18, if that person is themselves heir apparent). For a scenario in which George inherited as a minor, this would in practice mean both King Charles III and Prince William would already have to have died or become permanently incapacitated, since they currently stand ahead of George. Whoever is next in line after George at that point, most immediately expected to be his own younger sibling, Princess Charlotte or Prince Louis, once they reach the qualifying age, would take on the regency, assuming they meet the residency and citizenship requirements.
What a Regent can, and cannot, do
A regency grants real constitutional authority, but it is deliberately bounded. A Regent exercises the sovereign’s day-to-day duties, but the Act specifically bars a Regent from doing certain things on the young monarch’s behalf: they cannot alter the line of succession, and they cannot grant assent to any bill that would change the fundamental law governing the regency itself or the succession. The intention is straightforward: a Regent runs the institution temporarily, but cannot use that temporary power to permanently reshape it.
This has happened before, just not recently
A regency is not a hypothetical curiosity invented for modern royal-watching; Britain has used one in living constitutional memory. Between 1811 and 1820, the future George IV served as Prince Regent while his father, George III, was incapacitated by illness, giving the entire era its name, the Regency period, still recognisable today through its distinctive architecture and fashion. No British monarch has actually inherited the throne as a minor since the sixteenth century, when Edward VI became king in 1547 at just nine years old, but the legal machinery for handling it has been kept carefully up to date ever since, most recently via the Regency Acts of the twentieth century.
Why this scenario is, realistically, unlikely
None of this is meant to suggest George’s childhood coronation is imminent or expected; it would require both his father and grandfather to die or become incapacitated before George turns 18, an outcome nobody anticipates and one the current line of succession is not remotely close to. It is, rather, a useful illustration of how thoroughly the British constitutional system plans for contingencies most people never think to ask about, precisely so that a moment of genuine national crisis never has to also become a moment of constitutional uncertainty.
Browse more of our Royal Figures stories for how the modern monarchy actually works behind the ceremony.
Frequently asked questions
Can Prince George become king before he turns 18?
Yes. The crown passes immediately upon a monarch’s death regardless of the heir’s age. If George inherited as a minor, he would become King immediately, with a Regent exercising his constitutional duties until he turned 18.
What is the Regency Act 1937?
British legislation that sets out what happens if the monarch is under 18 or incapacitated, establishing that a Regent, generally the next person in the line of succession who meets age and residency requirements, exercises the sovereign’s official functions until the monarch can reign personally.
Who would be Prince George’s regent?
Whoever is next in the line of succession after George at the time, and meets the Act’s requirements of being a British citizen resident in the UK and of qualifying age. For George specifically, this scenario would require both King Charles III and Prince William to have already died or become incapacitated.
What can’t a royal regent do?
A Regent cannot alter the line of succession or grant assent to legislation that would change the fundamental laws governing the regency or succession itself, limiting their power to day-to-day constitutional duties rather than permanent structural change.
Has Britain ever had a child monarch before?
Yes, most notably Edward VI, who became king in 1547 at age nine. No British monarch has inherited the throne as a minor since then, though the legal framework for handling it, now the Regency Acts, has been maintained and updated regardless.
Is a regency the same as when George IV ruled for his father?
Similar in principle. Between 1811 and 1820, George IV served as Prince Regent for his incapacitated father, George III, giving the Regency era its name, though that regency was due to illness rather than the monarch being underage.
Constitutional details are drawn from the Regency Act 1937 and its amendments, as summarised by standard constitutional and royal-historical references; correct as of 2026.
