No such thing I’m afraid, no matter what material you chose.

For a long term frame though, I am really enjoying my Lynskey built 456 (with brake brace). Being a habitual frame seller / buyer in the past, Mrs Coolhandluke is happy to see that I have had my 456ti since 2009!

Ownership of this frame outlives all other hardtail frames I have had by a factor of about 5

’98 Hei Hei owned from new. It’ll take 100mm forks, has done everything from the Alps, to XC/24 racing and trail Centres and I have no plans to sell ever.
It would probably be a bit out of its depth at the Red Bull Run but horses for courses, so to answer your question – whatever you’re happy with is a bike for life.

Considering what a pain titanium is to work with and especially to repair, I’d say a 953 steel frame!

My On-One Tinbred was a frame for life, until I discovered 29ers…