You can’t take it with you.

People have tried for millennia to keep all their toys but eventually, there comes a time to step aside and pass the baton to the next person who needs a chance. It’s their turn, their time to take things and run. The tricky part, as in the new book “The Last Cowboys” by John Branch, is understanding when let go.

The seventh generation was coming up.

With 13 children and numerous grandchildren, sixth-generation rancher Bill Wright knew that his family’s spread in Utah, near Zion National Park, would likely be passed to one of them someday. Meanwhile, working cattle, maintaining water reservoirs, it was a full-time business, but ranching was in Wright’s blood.

Once, though, for him, there was the rodeo.

That was the other thing Wright, a former bronc rider, had bestowed upon his sons: love of rodeo. His eldest boy, Cody, had reached high-level status as a bronc rider, and Cody’s brothers were moving up the ranks behind him. There was pride in that, not envy, and a dream for Cody that he might someday compete alongside his own sons.

But bronc riding is a hard way to make a living. For eight seconds, a rider must maintain balance, position, and form while astride a bucking, twisting, jumping horse. Points come from rider and horse, both; purses are cumulative and help rank the riders. Injuries are so common, they’re almost expected.

Says Branch, “The next ride might be a winner. Or it might be the last.”

While his sons criss-crossed the country each summer to ride in as many rodeos as possible, Wright cared for the ranch his family loved. He “wasn’t sure about all the talk on climate change” but he knew things weren’t like they used to be. Areas that once had plenty of grass were now drier. Grazing permits for federal lands were a tangle of rules. Ranching got harder and harder each year – but how could he sell a generations-old legacy?

In a way, “The Last Cowboys” is one of the most time-stretching books you’ll ever read.

Half of it is written in eight-second timelines, as author John Branch describes the skill, technique and problems with staying on a rarely-ridden horse long enough to win what could be six-figure payouts. Though it’s difficult to read, Branch writes about how hard such a sport is on a man’s body, and how addicting it can be.

As it should, the other side of this book moseys through 150 years of ranch life. Branch describes beautiful, mountainous views; and dusty pastures often tied to bureaucracy and boundaries. This side gives readers a chance to dwell in the lushness while reading, with sinking feeling, about its dwindling appeal to newer generations.

In the end, the answers are as complicated as are the rules for bronc riding and grazing rights, and readers who cherish the Old West shouldn’t wait to read about this new one. Start “The Last Cowboys,” and you’ll want to take it everywhere with you.