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Phrase(s): It is better to wear out than to rust out.
Prov. It is better to work until you die than to be idle just because you are old. • Nancy: Grandma, you shouldn’t work so hard. You’re not young anymore, you know. Grandmother: Thanks for your concern, dear, but I plan to keep working. It’s better to wear out than to rust out. • Bill: You really ought to relax. I’m afraid you’ll kill yourself with too much work. Nancy: So what? It’s better to wear out than to rust out.
McGrawhill's American Idioms And Phrasal Verbs