I don't think there's a universal age limit for stainless lines, but as the economy has died since 2008-09, we're seeing track bikes have a much longer service life. With that comes other maintenance that for awhile wasn't a real big consideration (servicing caliper seals, lines, etc)
Obviously even with rubber lines, that rubber isn't the actual brake line, it's still the same inner core brake line (I forget what its made out of) found in stainless lines. As a mechanic in my past career, I've definitely seen older cars/trucks have collapsed brake lines.
I think the sheer nature of the sport doesn't allow brake lines to 'age'....personally, if the brake lines are north of 10 years old, I'd be looking at replacing them. So for today, that would be a 2013 model. So let's assume you bought the bike brand new, and put stainless lines on it the day you brought it home. It's very likely those lines are just fine. It's also likely that in the span of 10 years of track riding, you've probably had a crash that damaged the lines to a certain degree (tweaked/bent/broke at the master or whatever) that warranted replacing them...so they never get a chance to truly age out.
Golden rule...if you have doubt, replace them. A set of lines is what, $130 or so? Cheap insurance. New lines, rebuild kit for your calipers and/or MC, and be on your way.
I agree that the inverted T set up (also most common for stock setups) is the easiest to route/setup. It's all I run on my bikes, the 2 line setup just annoys me.
Obviously even with rubber lines, that rubber isn't the actual brake line, it's still the same inner core brake line (I forget what its made out of) found in stainless lines. As a mechanic in my past career, I've definitely seen older cars/trucks have collapsed brake lines.
I think the sheer nature of the sport doesn't allow brake lines to 'age'....personally, if the brake lines are north of 10 years old, I'd be looking at replacing them. So for today, that would be a 2013 model. So let's assume you bought the bike brand new, and put stainless lines on it the day you brought it home. It's very likely those lines are just fine. It's also likely that in the span of 10 years of track riding, you've probably had a crash that damaged the lines to a certain degree (tweaked/bent/broke at the master or whatever) that warranted replacing them...so they never get a chance to truly age out.
Golden rule...if you have doubt, replace them. A set of lines is what, $130 or so? Cheap insurance. New lines, rebuild kit for your calipers and/or MC, and be on your way.
I agree that the inverted T set up (also most common for stock setups) is the easiest to route/setup. It's all I run on my bikes, the 2 line setup just annoys me.