1994 HR215 SX - OEM Fuel Line and Breather Tube, Replace or Not?

I have never replaced the rubber OEM fuel line or rubber breather tube. The twenty year old mower runs like she did 20 years ago but you'd think after this amount of time the ethanol would play a factor, but hasn't. After a two and half hour run each week, I run the fuel out the carb but we know that the fuel remains in the rubber fuel line. What's bothersome is that if I replace them, they may not last as long as the OEM. Or you could say the opposite. Yes, I've read where just a miniscule micro piece of rubber will wreck havoc on the carb.

Let's open this puppy up for discussion...

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