The bars on my Enduro are over 4 years old, I have had them for over 3 years and bought them second hand.
The I have had the front wheel on my BFe for 4 years and that was also second hand when I got it. God knows how old my rear wheel on it is.
My road bike is mostly original and is a 1985 Raleigh Flite. When I got it the original tyres were still on it and so perished they had big holes in the sidewalls.