Anyone have experience with metal roofs? [with pics]

Hello guys,

I have a 4-plex with a metal roof. It was built in 1982 and the roof is original. It is currently functioning fine. A roofer I brought in during the inspection period said I had maybe 5 years left. He said if I painted it it could extend the life, but not sure how many years. Anyone ever dealt with something like this before? What kind of paint would be best?

Here are some pics I took. Note: the white stuff isn't snow; it's paint around where the screw are screwed in.

Thanks.

[IMG]http://i.imgur.com/jrFNMZd.jpg?1[/IMG]
[IMG]http://i.imgur.com/7M77Gv6.jpg?1[/IMG]
[IMG]http://i.imgur.com/8NCcOIw.jpg?1[/IMG]
[IMG]http://i.imgur.com/h4XTzFz.jpg?1[/IMG]