Given that February 14th has now passed, you would be 46 years old.
A composite number is an integer that is exactly divisible by at least one factor other than 1 and itself. There is an infinite number of composite numbers.
A prime number on the other hand can only be divided by 1 and itself. It's easy enough to infer that a composite number can be written as a product of prime factors:
2380 = 2 x 2 x 5 x 7 x 17
The first few composite numbers are:
Numbers which can be divided by other numbers besides 1. Numbers with factors besides 1 and themselves. Numbers which are not prime. 91 is composite because it is 13 x 7. But 41 is not composite because it is only 41 x 1. (of an integer) being the product of two or more factors greater than one; not prime.