Basically the issue with the knees is you don't want to start riding a horse too strenuously until the knees close. For each breed it is different. Some close at 3, others, like drafts and WBs, can wait until 5 or so.
the act of making or enacting laws. 2. a law or a body of laws enacted. Origin of legislation.
An Act of Parliament is a statute enacted as primary legislation by a national or sub-national parliament.In the Republic of Ireland the term Act of the Oireachtas is used, and in the United States the term Act of Congress is used. draft piece of legislation is called a bill, when this is passed by Parliament it becomes an Act and part of statute law. There are two types of bill and Act, public and private.