Originally Posted by
rekmeyata
Keep in mind too that most companies don't want you to able to ride a bike (or anything else for that matter!) for entire lifetime which is why aluminum bikes are still the most common frame sold because they're cheap and every 10 years give or take 5 years you have to buy another.
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but life expectancy for any steel or titanium will be forever...assuming no crashes or mistreatment of steel and allowing it to rust.
Hasn't been my experience so far since the only frame and fork failures I've had have been of steel frames and the bike which has lasted the longest is the only aluminum one I've had (145,000 miles over 25 years so far).