Hi, I hold a few tokens of varied nature and a few coins. I have setup a few eth addresses for the younger members of my family. I am talking about kids that are less than 3 yr old 
So, what would you include in their new accounts, so that they can use it in 15 yrs?
I only suggest to invest with ethereum and bitcoin, because this are most trusted coins in the market. Though there are lots of coins also that have potentials but considering the life span of holding(15yrs), it could be hard for that since the market is fast moving and changes may happen everytime. So, what would you include in their new accounts, so that they can use it in 15 yrs?