ICMs don't have an age limit.....they fail when they fail....2 days or 12 years.....Other components in the ignition system contribute to their failure...like ignition coil and spark plug wires, so they should be tested for resistance if they are getting old.
Pick up coils seem to work like they look. If it is getting ratty, change it...but you have to dis-assemble the distributor to do it.
edit: New parts sometimes hurt because many are inferior to what is on your car.
[This message has been edited by Gall757 (edited 04-02-2014).]