I don't think there will be any age constraints if that individual is still capable of being 16+ n 18+ to be competent and responsible for life. I find the case that the OP mentioned to be quite normal because the old men near the area where I live still have the habit of playing lottery tickets. We cannot impose opinions on anyone about how they should live, as long as it is within a framework suitable to the law as well as life circumstances, so that they are responsible for their actions.
True freedom in every decision, my grandfather (passed away) was also the owner of a gambling group and his children never forced him to stop, as long as everyone felt comfortable. I still remember the days when I was a child and was taken to breakfast with the money my grandfather had won from bets. It's not a story about earning extra income, but it brings joyful experiences in life which we don't always have the opportunity to enjoy again.