Don't bother yourself with such deep thoughts now which you can figure it out at that time depending on how you want it to be.
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It's a good thinking that you are considering if you can afford to gamble or not despite what age bracket you will be on. It's important to take things into consideration before planning and making a decision so you won't regret a thing later on. Additionally, it's best to be financially capable the moment you bet and play, regardless of age, but of course, not being underage or below age limit. Just be prepared so when the time comes, you still have so much to spare for gambling. Work your ass off now, then relax and enjoy your heart out later. It's better to have delayed gratification than to enjoy now and suffer later.