i have one question..
in 2011 bitcoins per 50,000 to 500,000 we spent for nothing, just pranking and stuff...
if one person kept 50,000 bitcoins in his account from 2011 up till now,
would the bitcoins still be valid for transactions?
It will be always valid for transaction, there are a lot of people today who are holding a huge amount of coins and they are all very wealthy so keep on holding your coins today in order to earn more profit in the future.