As of January 2010, Her Royal Highness Princess Beatrice of York, daughter of The Duke of York, is 5th in the Line of succession for the English Throne.
As of September 2021, the third in line of succession to the British throne is Prince George, son of Prince William and Catherine, Duchess of Cambridge.
Harry has not given up his right to the throne, he is currently fifth in the line of succession.
Anne, Princess Royal is currently tenth in the line of succession to the British throne.
Currently, Prince Harry is third in the line of succession to the British throne, behind his father Prince Charles and his older brother Prince William.
Yes, he could theoretically decline his title as King. At that point, Prince William is next in line to the throne.
Since his birth in 1948, Prince Charles has been the first in line to the British throne.
Prince William is second in the line of succession to the British throne, so he will someday be the king of England.
There is no specific legal age to take the British throne; a monarch can ascend to the throne immediately upon the death or abdication of the previous monarch. However, if the new monarch is under the age of 18, a regency may be established until they reach the age of majority. The current laws governing succession are outlined in the Act of Settlement 1701 and the Succession to the Crown Act 2013.
Fifth in line is Princess Beatrice, daughter of Prince Andrew. See the related question link below.
Prince Harry
Yes, Charles, Prince of Wales, is next in the line of succession to the British throne.
As of now, the heir to the British throne is Prince William, Duke of Cornwall and Cambridge. He is the eldest son of King Charles III. Following him in the line of succession is his eldest child, Prince George.