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?
It is very good idea to invest in cryptocurrency for long term investment. But two things need to remember first invest in top 100 Coins only and second login your wallet every month. So, what would you include in their new accounts, so that they can use it in 15 yrs?maybe he can choose the coins which in top 20 until top 50 because for the top 100 coins, it needs more time to analyze for each of coins. so if he can analyze for that top 25 coins, then I think he can select many coins and I am sure that he could have 10 coins to invest. so far, you need to invest in btc because this is the mother of cryptocurrency and the second you can go with ethereum. for the next coins, I think you need to analyze for each coin so you will find what coins that will work for you for a long term.