I started keeping ants when I was about 8. Though I was interested in them a long time before that.
I read everything I could get my hands on and one of books that really excited me when I was young was an old book by Sir John Lubbock called Ants, Bees and Wasps. It was written in 1929 - though I am guessing my copy is a reprint. A brilliant book, full of experiments on ants and bees conducted by the author.
My first attempt at keeping ants was Lasius niger, but unfortunately I managed to kill the queen while extracting the colony from a plant pot. Then when I was about 8 I was at a family friend's house in Wales, and while exploring their garden (mostly looking for ants, which is something I still do), I lifted a board that was on top of a compost heap and found a a large colony of Lasius niger including the queen. I managed to collect a large number of workers. I still remember getting this massive colony home and trying to work out how I could get them into the formicarium I had built (vertical, 2 sheets of glass with wood around the edges. I but the whole colony in a partly filled bath with a raised island. Nobody in my family was allowed to use the bath for a couple of days while the ants gradually moved into the formicarium. I kept them in the cellar surrounded by a moat of grease. I have to say that my mother was very supportive of my interest.
When I was about 9 or 10 I also kept Mymica ruginodis and Lasius flavus. I didn't know anyone else who kept ants so I was pretty much self-taught. I learned that horizontal formicariums tend to work better for ants such as Lasius niger, Lasius flavus and Myrmica r. species.
I raised my first Lasius niger colony from a nuptial flight queen when I was about 14, and kept this through school and even took it with me to university. At around that time I also brought back a number of queens and small colonies from visits to the South of France.
After that my lifestyle was less settled. I think people tend to move around a fair bit in their early 20's and keeping ants was more difficult. I did have a couple of colonies or Monomorium pharaonis - in escape proof, sealed tube formicaria. One of which I even installed on my desk at work. I want to make it clear that I know the risks with M pharaonis, and am not advising them as a good choice for people who aren't v. experienced with ants in captivity, or who aren't old enough to deal with the consequences if things go wrong.
I have continued to read extensively on ants. My favourite book, was a bit of an investment, but I would consider it a must for anyone who is passionate about developing their knowledge -
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More recently I have kept Pheidole pallidula - as described on another thread.
And this year I temporarily kept Myrmicra r again because they are common in my garden - though I released the colony again when it grew.
I have also done a lot of travelling, where observing ants has been a big part of the motivation. So Europe, various parts of Africa, Madagascar and Australia (South America is next on the list).
I am now settled in a bigger house with my partner and intend to start keeping ants again more seriously, though I am more interested in species that I have a particular passion for and these tend to be European or more exotic.
I noticed a few people on this thread are a little embarassed about their hobby and I would counter this by saying that I have never been shy about talking to people about ants. I have found girlfriends, friends, colleagues, people i've met are generally fascinated by ants. It's true that some people have a general dislike for 'creepy crawlies', but there is a almost universal interest in the mechanics of social insect societies.
I generally talk to people about the concept of emergence and parallels with other emergent systems. Our brains are a good example of this - lots of simple units co-operating to generate complex behaviour and even memories, where no individual entity can be said to hold that memory or plan of behaviour. And when it comes to sexual reproduction, ant colonies can be compared to complex multi-cellular organisms such as ourselves. After all most of the cells in your body (workers), and that includes the cells in our brains, only exist to allow the cells in our gonads to reproduce. Perhaps what I'm trying to say is that people are interested in ants if you can explain how things about ants relate to ourselves.
During my travels in Madagascar last year I was thrilled at the reaction of the national park guides, who were incredibly enthusiastic about learning about ants - inhabitants of the environment to which they'd previously paid very little attention.
Sorry for the long post.