fountain pens are the best for BIFL; if you are serious, finding a fountain pen that works for you and learning to effectively clean, refill, and use it is your best bet
but this person claims they have used a Parker pen that they inherited that was manufactured in the 1970s and which they still make refills for … refills for a pen like that might be more expensive, and in general ballpoint pens are not going to last as long (and generally over a lifetime you won’t find pen companies that continue to manufacture compatible refills), but this might be a backup option if you just won’t consider fountain pens
Non fountain pen option? I’m not a fan of
fountain pens are the best for BIFL; if you are serious, finding a fountain pen that works for you and learning to effectively clean, refill, and use it is your best bet
but this person claims they have used a Parker pen that they inherited that was manufactured in the 1970s and which they still make refills for … refills for a pen like that might be more expensive, and in general ballpoint pens are not going to last as long (and generally over a lifetime you won’t find pen companies that continue to manufacture compatible refills), but this might be a backup option if you just won’t consider fountain pens