Winnebago Industries Inc.’s stock rocketed to its biggest one-day gain in more than four decades on Wednesday, after the company said it’s been attracting more youthful buyers for its recreation vehicles and boats.

While Winnebago

WGO has long been an attractive option for retirees and older people who can afford an RV — which can cost hundreds of thousands of dollars — the company said it’s now seeing a wider range of buyers.