I think I know what you're experiencing. I was there a few months ago. You say you're unable to clear your mind? Well before I was able to clear my mind, I couldn't get anything accomplished. From what it seems to me, thoughts lead to either falling asleep or staying fully awake. If you think to hard on something, you can't relax to the point to get everything else started up. If you just let your thoughts carry you along, you get lost in thoughts and then fall asleep. So the solution to this is not thinking about anything.
How do you not think about anything, you may be asking? Well, I read somewhere to concentrate only on breathing for 3-4 minutes. Once you can do that, you can focus your mind on breathing for as long as you want. The trick is in training your mind to stay silent for that long. Before I started practicing that I couldn't go more than 20-30 seconds without my mind wandering into another thought. If another thought comes into your mind, just push it off to the side and ignore it completely. Do this for every thought that comes up.
Once you can hold the thought of ONLY breathing for as long as you want, stop focusing on breathing and just focus on nothing. Ignore any thought that comes into the mind. This is what it means to hold the mind clear.
I don't know if they have it in Chile, but there is a game that children play here in the United States called "Connect-the-Dots". According to Wikipedia, its called "Une Los Puntos" in spanish. Maybe this can help you understand what I'm talking about if you don't already: http://es.wikipedia.org/wiki/Une_los_puntos.
Anyways... I like to use the analogy of connect the dots. Imagine the dots as thoughts that might come up in your head when you are trying to clear your mind. Imagine the pencil or pen is your consciousness that connects the dots. As long as you don't draw on the paper, the dots cannot be connected, and there is no image. This is the same as what you need to do in your mind. Sometimes a random thought might come up in your mind, but as long as you don't focus your consciousness on it, it will just fade away and your mind, like the paper, will be blank.
I would say practice this before you do anything else... I made almost no progress until I was able to clear my mind fully. Although it is a little bit harder because of distractions, you can practice focusing on breath or nothing while waiting in lines, while traveling to places, or other times during the day when you normally aren't actively using your mind. This can get you more practice during the day during periods of time when you normally wouldn't be doing anything. If anyone else is reading this, I HIGHLY advise against doing this while driving, because driving requires your full concentration. This should be obvious.
You asked if it is it going to take long to do? Well honestly I've made nearly all of my meaningful progress in the last month after I learned how to clear my mind. Now... I don't claim to be able to experience them regularly, but I did have one last night, and last week. How long it takes depends on how much you want to do it. If you REALLY REALLY want to do it, and you spend a lot of time practicing, you could do it in a few weeks. Just don't practice too much because you can throw off your sleep cycle. About the magnetic thing that you mentioned... I've read a little about it, and I think it has some truth to it, but I don't think age will prevent you altogether from OBE's. Every time when I've been very sick for as far back as I can remember, I would get these strange feelings of having my body shrink to a microscopic size or grow to an unimaginable size. I started noticing this feeling during OBE practices. Once you start feeling this, you're on the right track. If you can't get past this, you might not be fully relaxed, or you might not have your mind fully clear.
As to asking questions, it's not annoying. Albert Einstein once said: "The important thing is to not stop asking questions". When we stop asking questions we become close minded and ignorant. Questions bring knowledge when they are answered, and knowledge is power.
How do you not think about anything, you may be asking? Well, I read somewhere to concentrate only on breathing for 3-4 minutes. Once you can do that, you can focus your mind on breathing for as long as you want. The trick is in training your mind to stay silent for that long. Before I started practicing that I couldn't go more than 20-30 seconds without my mind wandering into another thought. If another thought comes into your mind, just push it off to the side and ignore it completely. Do this for every thought that comes up.
Once you can hold the thought of ONLY breathing for as long as you want, stop focusing on breathing and just focus on nothing. Ignore any thought that comes into the mind. This is what it means to hold the mind clear.
I don't know if they have it in Chile, but there is a game that children play here in the United States called "Connect-the-Dots". According to Wikipedia, its called "Une Los Puntos" in spanish. Maybe this can help you understand what I'm talking about if you don't already: http://es.wikipedia.org/wiki/Une_los_puntos.
Anyways... I like to use the analogy of connect the dots. Imagine the dots as thoughts that might come up in your head when you are trying to clear your mind. Imagine the pencil or pen is your consciousness that connects the dots. As long as you don't draw on the paper, the dots cannot be connected, and there is no image. This is the same as what you need to do in your mind. Sometimes a random thought might come up in your mind, but as long as you don't focus your consciousness on it, it will just fade away and your mind, like the paper, will be blank.
I would say practice this before you do anything else... I made almost no progress until I was able to clear my mind fully. Although it is a little bit harder because of distractions, you can practice focusing on breath or nothing while waiting in lines, while traveling to places, or other times during the day when you normally aren't actively using your mind. This can get you more practice during the day during periods of time when you normally wouldn't be doing anything. If anyone else is reading this, I HIGHLY advise against doing this while driving, because driving requires your full concentration. This should be obvious.
You asked if it is it going to take long to do? Well honestly I've made nearly all of my meaningful progress in the last month after I learned how to clear my mind. Now... I don't claim to be able to experience them regularly, but I did have one last night, and last week. How long it takes depends on how much you want to do it. If you REALLY REALLY want to do it, and you spend a lot of time practicing, you could do it in a few weeks. Just don't practice too much because you can throw off your sleep cycle. About the magnetic thing that you mentioned... I've read a little about it, and I think it has some truth to it, but I don't think age will prevent you altogether from OBE's. Every time when I've been very sick for as far back as I can remember, I would get these strange feelings of having my body shrink to a microscopic size or grow to an unimaginable size. I started noticing this feeling during OBE practices. Once you start feeling this, you're on the right track. If you can't get past this, you might not be fully relaxed, or you might not have your mind fully clear.
As to asking questions, it's not annoying. Albert Einstein once said: "The important thing is to not stop asking questions". When we stop asking questions we become close minded and ignorant. Questions bring knowledge when they are answered, and knowledge is power.