Maybe Cael will want to do this for more than 20 years, we'll see. He's clearly the coach until he decides otherwise. But I, for one, won't be surprised to see him take a different job before he signs up for Social Security.
CS marches to his own drummer. In that context, none of us know what his future plans are. That said, look at what he's built since he (rather surprisingly to many, including PSU fans) approached PSU about their open wrestling position. How many people walk away from that level of success at a relatively young age? He pretty much has established a dynasty at PSU with wrestling, and it shows no signs of abating. As the recent OTTs showed, he's also built a very successful RTC with the NLWC.
Could he leave PSU at a young age? Anything is possible. Perhaps he wants to spend more time going to his kid's sporting events when they are in high school/college. Perhaps he'll have more money than he'll ever need, so he'll decide the daily grind isn't worth it.
If I were looking for a more likely reason for him to leave at age before his 60s, it would be that years of wrestling (as a competitor and a coach in the practice room) catch up to his body. And since his two assistant coaches are around the same age as is CS, that could happen to several of them around the same time. CS has shown an ability to adapt to situations, so I suspect that he could figure out how to continue coaching even if his body could no longer engage in practice room battles.
Retiring in 10 years? Well, anything is possible, though I'd be pretty shocked if that happened.
Either way, I'm getting more and more impressed with Gilman over time--it's admittedly very difficult to predict which athletes will become the best coaches, but I can see him on that path...
Gilman has shown a lot of growth, both as a wrestler and as a person, in recent years. I always respected his wrestling abilities when he was competing for Iowa. I just wasn't a big fan of his antics during stoppages, before and after matches, etc.
That said, his Olympic career is likely to be over in less than 10 years. Who knows what he wants to do at that point. He may want to get into coaching. I don't see any openings at PSU in the next decade for wrestling coaches. And even if there were, there a lot of PSU wrestlers, as well as experienced college wrestling coaches, who you'd have to think would be much higher than Gilman on PSU's assistant coach or head coach search committee.