Meniscus root tear, 31 years old, no pain

I have been diagnosed with a meniscus root tear. I had an ACL repair 11 years ago. I have been very active and am able to ski, surf, hike and pretty much do anything. The only symptoms I have are swelling maybe once per year. No pain. A root repair has been recommended, but it just seems crazy to have knee surgery when I have great functions and no pain. Basically, I have been told that the procedure is needed to get me to a more appropriate age before I have a knee replacement. I know that I am very young for this, but would like to hear from anyone that may have experience or knowledge.