Those harder plastic tubes are usually pretty telling when they've reached the end of their service days. If the end of the tube (where it meets with the white PVC pipes) is not all janky and crumbling, and there's no obvious leaks coming from the tube when water is going through it, you'll probably be ok!

Edit: good job for trying to do this one on your own! It probably seems daunting, but I'm sure you can figure it out. 👍🏾