It is true that in early days we could have mined 50 BTC a day, Not only 50 a day 50 per hour if we were earlier "Together with Satoshi" I was not that lucky enough but when I started mining with my GPU I was mining somewhere 1 to 1.3 BTC per day. I get questioned from lots of my friends did you keep all of your Bitcoin till date? Of course not because back then Bitcoin literally had no Value and it was just a test Lucky me that because of my computer background I got into Bitcoin Mining if not I would have heard about Bitcoin in 2017 Boom.

There are so many stories about BTC Prices and 10K Bitcoin Pizza which I believe are legendary people and we should respect because that 10K Bitcoin Pizza made Bitcoin a valuable asset back then and test was complete that we can actually have Virtual Currency. For me They are equally respectable as much as I respect Satoshi.

Back to your topic
So many of those wallet who mined back in those days lost there coins and private keys because of its value, After we got some value we lost more coins in Exchanges like Mt Gox , Cryptsy and so onnnnnn. Now days even $100 investors think about Paper Wallet / Hardware wallet and so many options to save exchange account passwords but back in those days we didn't care much about that.   

If you had you would have done the same thing others Did. You may not have those 50BTC block reward holding till now but yes you would have more than what you have today but its never late to start here.