Bob Galvin transformed Motorola into a global telecommunications giant and helped usher in the wireless age. Now, at 85, he's searching for a solution to the nation's energy crunch.

Bert Roper, 83, has been an innovator in the citrus industry for more than six decades. Now, the Agriculture Hall of Famer is branching out to other entrepreneurial and environmental ventures.

When he's not jetting off to Africa, to oversee an American-style hospital his architecture firm is designing, 81-year-old Bernard Rothzeid is back in New York, sketching, brokering new deals, and breaking bread with clients.

Iris Rubinfield helped her husband build a successful manufacturing company. When he passed away, she suddenly found herself at the helm. Nearly three decades later, she's transformed it into one of America's fastest-growing private companies.

Jeno Paulucci counts more than 70 companies to his credit, including several major frozen-food brands. At 89, he's getting ready to launch another new venture -- in an attempt to take on Hot Pockets.

Jack Weil's clothing company, Rockmount Ranch Wear, was made popular by the likes of Clark Gable, Elvis, and other celebrities. Today, Weil still keeps the customers coming in droves. Oh, did we mention he's 106? Meet the oldest entrepreneur in America.

Like millions of women, Lisa Gable was often frustrated by falling bra straps. So, at age 70, she designed a solution and launched an intimate apparel company. Fourteen years later, she's still at the helm -- and her Strap-Mate can be found at Nordstrom and other major retailers.

Phyllis Apple started a thriving public-relations firm at an age when most people start mulling retirement. Nearly three decades later, this 84-year-old CEO is still putting in 40-hour work weeks.