Hi There, I am over 65 and very active with SBI, I have my own site which I am very passionate about. Sure, it takes time and sweat but at the end of the day it is worth it.
As they say at SBI, if you have a passion for something and apply your knowledge, you will win and earn money doing it. If it is not fun, then do not do it. I manage to make a few bob which helps to pay the bills but it really is a lot more more than that.
My recommendations are that you should do it - whatever that is - but be sure you are passionate about what you do. There are failures with SBI but it is mainly because people do not follow the Guide laid out quite plainly by SBI.
There is really nothing else on the internet in my opinion to compare to the service, support and even with the forum help - it is unbeatable. So go for it.