The reasons for a person becoming a servant or an elder are really strange. If you're a male, all you have to do is boost your service hours and comment more and within a couple of years you'll be a servant. Then, once you become a servant, you can do next to nothing and remain a servant for years. Or if you're a servant who wants to be an elder, you can pretty much just keep doing what you've been doing, and within five or ten years you'll become an elder. The appointments from servant to elder can seem really arbitrary. Sometimes age has a lot to do with it. Or maybe good looks.
All I know is that once you're appointed anything, you start to think about why you were appointed, or at least why you were appointed at the time you were appointed. It's sort of like when you're a little kid and you turn eleven. You think to yourself, "Wow, I'm eleven now, but I don't feel any different!" And you start to question the meaning of the age number. When you're appointed, you think about how you're essentially no different than you were a year ago, or two years ago. You're no better as a person, you have basically the same hopes and flaws, basically the same spirituality level. And yet here you are, an appointed person. And then you start thinking about all the things you've done wrong, little or big, and how undeserving you are to be appointed anything.