I'm not sure that age is the real factor. If the spars are not creased or cracked, you should be ok. The weak points are where dissimilar metal hardware has been attached. Should an attachment be compromised, over-drilling and using helical inserts can fix a problem. In the extreme case, a stainless plate can be made to fit over the area. The plate may be threaded with the holes in the same location. If accessible, the plate can be put on the inside of the mast resulting in a stronger attachment point. If external, proper attaching the plate with helical inserts and appropriate sized fasteners will work.
When I had J/30 Rhapsody I had a similar issue with the clew slug pulling out. This was fixed by using a Velcro loop available from sailmakers that is wrapped around the boom through the clew to hold the clew to the boom. On my J/109 now I use the Velcro strop and no longer use a clew slug. My mast was replaced 3 years back resulting from damage when the boat blew over when on the hard during a winter storm. All mast and boom attachments use the helical thread inserts.
Proper rig inspections should be able to determine if there are issues that need addressing. Items that are fastened to the mast & boom with screws may be "upgraded" to prevent the aluminum to stainless electrolysis issues. I use helical threaded inserts (like these on Amazon
) for this. The coils are inserted by drilling and tapping the mast, the hole is threaded with a tap, and the insert screwed in with red (permanent) Loctite using the insertion tool that comes with the kit. Only the outer threads on the insert use Loctite.
The Loctite must cure before using screws for attachment. The Loctite when cured provides a passivation boundary to prevent the electrolysis.