Question about replacing tubes with new tires

[burkbuilds]

Sometime in the next few months I'll be installing new tires on my 09 Vulcan. Right now I've gone about 12,000 miles and it looks like I'll probably be replacing both front and rear tires about the same time probably within the next 3,000 miles or so. I bought tubes to go into the new tires, but since the ones now in service are less than a year old, do I really need to replace them when I put the new tires on or can I use the existing ones again. One reason I ask is that I put a product called Ride-On in the tubes when I first got them that's supposedly able to seal punctures in tubes up to 1/8" and also helps automatically balance the tires. It's almost $30 to buy enough product to do both tires, and if I don't have to replace the tubes right now, then I don't have to spend another $30 on the ride-on product. I have heard people say that you should replace the tubes when you replace the tires, but I'm also assuming most people don't go through tires once a year so maybe they are assuming tire replacement every 4-5 years on average and another 4-5 years before it happens again and it's not likely that tubes will last 8-10 years so you should replace them with the tires. Is that the general assumption, or do tubes have a mileage life like a tread and even if they are just a year old they should be replaced?