Im not an admin, but I have been following the development of LIG for some time. My understanding is that the amount of LIG given to the populous of a country (underline) will be in part determined by the profits generated from the country's (underline) resources. So in theory, some resource rich countries will turn out a greater profit that other countries. So this, as Im sure you could imagine, would play a part in determining how much LIG that citizens will receive, and perhaps whether LIG may be restricted to certain age groups. This is all speculation of course, but it makes sense to me.
Personally, I see the benefits of giving an LIG reserved especially for children (or the non-working class). To give a few reasons for this view: children with abusive parents could theoretically opt out of their families, and move out to a suitable place with suitable people. For a more concrete example, one can look at child brides, which still happen today in India. The primary reason why parents would marry off their kids at such a young age, is a financial one. If LIG were provided, children could be more independent, and perhaps the state can recognize children's rights. In United States at least they are regarded as dependents of the parents, which make sense because the children depend on the parents, to the point, for money. So what I am beginning to see is that LIG will not only change our economy, but also out social, moral, spiritual values, familial relations, and relation between the government and the people. Just to share, I always wanted government to be as caring as the most caring person. For me, LIG is a step in that direction, and may finally realize that vision.
Now that I laid some basic groundwork, to answer your questions. As a reminder, in democratic nations at least, the people can vote and decide whatever policy they wish their government to adopt. In United States, for example, even though we have a represented democracy (politicians) the people can choose to bypass their politicians and vote directly on an issue, but they require a large majority, around 3/4 of the votes (its written in the US constitution). This might have happened once before, I forgot, but I do remember reading that when we studied the Constitution in my Civics class. Whatever the case may be, when 3/4 of the population of whatever country, state, or city (or even household) want to enact same law, rule, or adopt some proposition, there really isn't much that can stop them but themselves, even by brute force alone. Fortunately we aim to be more civilized, and so avoid violence where possible, so we call that voting! haha. So if LIG were adopted in Norway or in South Africa, they may differ in some respects, because it really depends on how the voters accept that proposition, called LIG. I believe that it is the Equal Life Foundation that has created the LIG proposal. I don't wish to be nitpicky, however I am forced to be that because of how you phrased your question and what it implies about your current understanding about LIG. So again, LIG is a proposal, and it has been worked by real people who are coming at an understanding of what works and what doesn't work, and the real practical considerations that come into play when working with real countries that have unique situations. Because this is the case, LIG can change, and what ELF's current stance on LIG can change, and ELF has already recognized, I believe, that each country will have to implement LIG in the format that best fits that country.
My view on whether LIG should or should not, or will or will not be different depended on the age, developmental stage, physical capability/handicap of a person, is that it will probably include these factors and many more factors such as what are the things that is required by people, in their various circumstances, and whether the LIG produced from the country's natural resources, is enough to cover those needs. If its not, then some adjustments will need to be made. If it is enough, well its enough, so I don't have to say much else, right? I wrote a very large sentence with many clauses, so to summarize myself and repeat myself, LIG's goal, Im fairly sure though don't take me as the authority figure, is to meet people's needs. This might or might not have been discussed yet, about LIG, but a practical approach of determining needs, is to make a list that prioritizes the needs from the most life essential (healthy food and clean water) to the least essential (entertainment) (FYI I place entertainment because you can find entertainment for FREE easily). But it seems best too if the citizens of a country decide what are their most basic needs and have LIG be sent to meet that goal. In my opinion, humans needs will be similar because we are biologically similar. I mean, they say that the differences between "races" is less than a percentage point of the total genetic coding. That is why I suggest we use some of the body of knowledge within the science and medical fields, and ask what the experts of those fields what they would recommend the LIG money be used for first due to our physical makeup. I would say that this could include things that provide stress-relief, since stress also affects our health in large quantities. So in terms of children, children may require different things due to the fact that they are so quickly developing, and so they could require specialized equipment or support. I have heard often how the children of wealthier families receive many kinds of special support, and that this helps in their development of both their minds and body. And because childhood is such a sensitive time, meaning, what happens in your childhood could determine the rest of your life, it certainly pertinent to provide support. There will most likely be a balance between the LIG given to children and adults, which would be too presumptuous of me to claim to know the details of that.
I sincerely hope this clears up some of your question or curiosity. As I stated earlier I have been following the development LIG, but I am certainly fallible. So let me know of any mistakes or shortcomings in my answer, and will do my best to review that feedback and make necessary adjustments both in my understanding and explanation of the subject.