Well, that's not that different. That's 21 years after the life of some person in being. If you want it to last a long time, you say youngest living descendant

Well, that's not that different. That's 21 years after the life of some person in being. If you want it to last a long time, you say youngest living descendant of someone well-known, like the King of England, as then you presumably get the full ~90 years of some baby plus 21 years. Corporate copyrights last a flat 95 years from publication. Also, half of the US states have effectively done away the rule against perpetuities and statutorily allow perpetual trusts now: http://www.law.harvard.edu/programs/olin_center/papers/pdf/Sitkoff_790.pdf#page=15 http://www.law.harvard.edu/programs/olin_center/papers/pdf/S...