It is not just hard but it is simply not possible to know if how many users are using bitcoin worldwide or how many users are joining daily weekly or monthly, because there is no one platform where all the bitcoin users are counted so that someone could know how many they are.

bitcoin is really great currency that people use worldwide and in my opinion you are right that we will never know how much people are actually using it, though it isnt a bad thing

You could potentially go online and get places to do surveys as to whether or not they use Bitcoin, or you could look at the shops or businesses around where you are and if they accept Bitcoin ask them how often they get business in Bitcoin. That might give you a small to mediocre percentage idea o how many people use Bitcoin in your area, without it having to be obvious.

I have frankly no idea about actual number of bitcoin users. There are two kinds of people, one who are active and others are passive so it’s really difficult to determine actual figure of user base. We can have a look on on total number of wallets at popular online wallet providers and calculate offline cold storage wallet users (well that’s difficult too).

While talking about India, I read that there are nearly 10,000 bitcoins users and that is less than 0.00001% of actual population.

No i dont think so.  Your statistics is quite too low  i think that would only apply maybe in uk or china?. I believe that we are currently in 15-25% right now.  Well i am not saying that i am right

yeah maybe I will be very surprised when I saw the actual totoal bitcoin users because this might be unexpected. probably bitcoin users has exceeded 10 million. it's my hope. I hope it really happens and I hope bitcoin user growth will continue

Its impossible to count bitcoin users right now we dont know how much we are..
10 billion is very large number for bitcoin user i think we are just hundred thousands. this is just my speculation..

There is no way to determine the exact number or bitcoin users cause just like nyself I think some people are using more than one wallet.  Jusr like the others are saying, I also think that there is an increasing number of bitcoin users

Exactly, and even if the users don't increase but the number of wallets are increasing every time because everyone make new wallets for splitting and storing their funds to stay safe from hacks or such things, so that does not let anything count the exact numbers of users in bitcoin community.

It is hard to determine the actual number of people but I think in terms of age range then I can guess around the age of 20s and 30s because they are the ones who are well versed with the new technology and witness the change of economy from industrial age to information age in which the transactions and jobs as well were highly dependent on technology. At the start of bitcoin's creation they were there and since they can understand technology than the older ones who will just stick to the old ways, they adopt bitcoin. They are the ones also who are most likely that can afford to buy bitcoin because they have work or has business and still can do something to make it grow with their own effort because they understand the technology and for the older ones, they will most likely just invest in bitcoin and earn from it by having passive income.