Is it illegal to download games of the internet And how can yo get caught Even though if the game is old

If by "games" you mean retail games, not flash games, then yes, it's definitely illegal, and you can get caught, though there is a small chance due to the number of people that pirate games. Even old games generally have copyright laws that theoretically can still get enforced, though they obviously won't enforce the law for that game forever. However, I wouldn't pirate games at all because even though there is only that small chance of getting caught, you could be sued for millions of dollars and get you or your loved ones' lives ruined just because you didn't want to pay less than a hundred dollars for a single video game.