From what I have seen around I would agree with Rui that girls seem to buy more manga than guys.
I am 35 year old male, so fall in about the middle of that age range. I have a reasonable job as a design engineer with a gas distribution network earning in the upper 20k range so not mega money but not poor student money either. I don't go on foreign holidays, don't drink much and seldom go out nowadays (just seems too much hassle to organise everyone). This means I have a reasonable amount of money to spend on my main hobbies of anime/manga, comics, home cinema and archery. Although sometimes I should rein myself in a bit to spend less.
I am 35 year old male, so fall in about the middle of that age range. I have a reasonable job as a design engineer with a gas distribution network earning in the upper 20k range so not mega money but not poor student money either. I don't go on foreign holidays, don't drink much and seldom go out nowadays (just seems too much hassle to organise everyone). This means I have a reasonable amount of money to spend on my main hobbies of anime/manga, comics, home cinema and archery. Although sometimes I should rein myself in a bit to spend less.