以上means "over" a certain level or number.
when used as a predicate the verb 在is often used before it
1) 根据法律， 二十一岁以上的人才能喝酒。
when来is precedded by a time expression, it means "during....," and can be replaced by 以来. But when 以来is preceded by an event, it means "since (the happening of that event up to now)" and cannot be replaced by 来. (see L18)
所谓, meaning "what is called," is used to introduce a term which is then explained in the following phrase or clause. 所谓 means "so-called" when it is used to quote someone else and usually implies disagreement.