Know one can answer your question correctly unless the gambling sites give people statistics of the age group of the Filipinos that are gambling on their gambling sites. Or if a research is done about it. But I still think that young people are the people that are gambling the most. I mean according to general statistics in the world, people that gamble the most fall under the age of 25 to 50. I do not think that can be different in Philippines.
I would agree with you, because most of us on this forum are not from the Philippines and we don't know the statistics of gamblers in the Philippines. So it's really hard to say whether the age of those who are approaching retirement is ahead of the curve in terms of gambling addiction.
However, if we imagine from a general sense, most of the addicted gamblers currently gamble in online casinos, and as a third-world country, I don't think the Filipino old ages peoples knows enough about the internet to get addicted to online casino games.