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Age was catching up with Len Mattioli until he discovered a bicycle with an electric motor.

Now he’s in better shape, has a store full of the battery-powered rides and is in the midst of an expansion when most people his age — 74 — would be thinking of retirement. Retail, enthusiasm and passion are in the DNA of Mattioli who spent nearly four decades selling us televisions, stereos and dishwashers at the now-defunct American TV & Appliance.

Four years after launching what he thought would be a part-time gig selling a couple dozen bikes a month has turned into a full-blown job for Mattioli. His Crazy Lenny’s E-Bikes has blossomed into a thriving business that sells electric bikes to customers around the country and even abroad.

“I really enjoy coming to work,” Mattioli said last week. “This is the best product I’ve ever seen since someone walked into my old, old store in 1970 with a microwave oven.”