Yeah, for me I'm on year 12 of them and they are still producing big time. Over the years they got a better looking than mine, but mine still aren't too bad. I have 3900 or so sq feet including my basement and my kids are older than yours (17, 17, 19). But, we are still a good 16 years from retirement, so we will be here for many more years. If people know they are going to be in their homes for a while, I think they are totally worth it. I've mentioned before I didn't install them, I moved in here when they were 4 years old. But with the savings and checks, these would have been paid off in less than 5 years (prior owner paid off up front). The main issue, on year 9, I had a problem with an inverter box. By then, the guys coming out to try to fix them acted like they were looking at a dinosaur and weren't trained on "old" systems. Tech has jumped a ton over that period and it took around 20 months to finally find someone that knew what they were doing.