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Your age is a linear function (of time).
Rational function can be used in real life in modeling multi-person work problems.
If you are asking about periodic function in the real world, than there are millions of examples. The first one that comes to mind are the sin and cos functions. These are used in almost every field of science.
Unless you are an electrical engineer or a math teacher, every number you will ever use in a real world situation will be a real number.
a function whose range is in the real number