Recently many people who bought bitcoin years ago find themselves sitting on an untouchable bounty. Those lucky guys who purchased or mined just a few bitcoins at the start of the age of cryptocurrency nowadays can boast about their savings. However, some of them are now in a painful limbo，because they can't remember the complex security passwords needed to get to their bitcoin wallet. Unlike a bank, bitcoin has no central hotline to call for a reset. This is really a bad thing，it's like forgetting a bank account password, but there's no bank to call to reset it. That money is lost forever. That might be a lot of money at todays exchange rate.
Actyally, this bad thing happened to me last year, and my friend recommend this website：
http://recovermybtc.com/ to me，she said she has retrieved her bitcoin wallet password through it，and I download this software，it really works after I used it，and you need to pay some service fee to them, but it's not high.Somebody who lost their bitcoin password can make a try, good luck.
In my own opinion, it can be quite unfortunate and painful for you if you will lose your wallet password because you can no longer gain some access to your investments. So I think, it is more advisable for users to have a paper wallet. Because password based on whatever informations, it means that you are vulnerable and some hackers can access it and can steel your account from you.