The serial number 5591101 on a Mercury 4hp outboard motor indicates that it was manufactured in 1982. Mercury outboard motors typically have a serial number system that correlates to specific production years, and this number falls within the range for that year. For precise identification, you can also check the manufacturer's resources or consult a Mercury dealer.
To find out how old a 4HP Mercury outboard is, you can look at the label on the transom bracket, where you will see a two digit number giving you the year it was built.
You may have mistaken the '1' for a '2'..if your engine is a 4hp 2 cylinder it dates from 1978.
1969
The 4WF69B model, 4hp Johnson, would be a 1969 year model.
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