The end of 2014 and beginning of 2015
I heard about bitcoin before that but I wasn't as interested as I am right now and last year.

2010

Since August 2015 I am involved with Bitcoin. I knowed since almost the start about it but never did any research about it. Stupid me I didn't faster then 2015.

Around 2012 heard of it but never gave it must attention which is a shame for me!  then got back to it when there was a news story about some guy chucking out his hard drive which was worth a lot of money, this was 2013.

Came to know about this in 2011, but was not able to buy them...
Unlucky in few matters, but then heard back of it in 2013 when it surprised everyone with that huge spike...

Summer of 2013.

I remember at the end 2009 when i had some small online business, one friend of mine told me to accept bitcoins for some items that i was selling... nah, we decided that we want fiat instead of bitcoins...obviously this was a bad decision...

Now back to 2014 the same friend and me, start to getting involved with bitcoin.

I got aware of it in year 2014 and I learned that it was too late then to mine or buy it cheap. It pains me because I was online almost everyday from way earlier than that but was busy with other nonsense useless things.

Just read a thread somewhere on the forum and a guy mined 450 coins in year 2010 probably using his computer. Bitcoin changed life of early adopters completely.

I see a lot of people that they know bitcoin in 2009 where was I???
Well that time bitcoin was so worthless, but at the end in came good that the price now is kinda high.
Also is stable for me this is actually a good price if you tell me.

Well, I think bitcoins has unlimited opportunities for everyone and scope beyond the expectations, I often wonder why government don't allow digital currency and crypto currency as legal.

Btw I came to know of bitcoins around 3 years back