Assuming you are talking about a Marlin lever action made in recent decades, start with 100 and subtract the first 2 digits of the gun's serial number; 100 - 13 = 87 (1987).
Your Marlin model 30AS was made by Marlin in the year 1995 with the serial number that you provided.
The serial number you provided indicates that your marlin model 336R(rifle) was made in 1967.
The serial number will equate to a year.
Your serial number indicates that your Marlin model 60 rifle was made in the year 1973.
With the serial number that you have supplied;your Marlin model 336 rifle was made in the year 1984.
With the serial number that you provided,your Marlin model 39M was produced in the year 1973.
Your serial number indicates that your Marlin model 336cs was made in the year 1995.
Your 35cal marlin was made in 1963.
The letters AD which is a prefix to your serial number indicates that your Marlin rifle was made in the year 1968.
Your serial number indicates that your Marlin model 25MN was made in the year 1993.
With the serial number that you provided,your Marlin model 1893 rifle was made in the year 1899.
Your serial number indicates that your Marlin model 30A was made in the year 1979.