Jerry and Arlene Rosenstein have spent lifetimes reinventing themselves.

The Brentwood couple began their careers as teachers in the Los Angeles Unified School District.

Later they migrated to the high-tech industry and Pioneer Magnetics, a Santa Monica manufacturer of power supply equipment, where Jerry Rosenstein is chief executive and his wife worked as quality control trainer before retiring.

Now, at a time in life when many consider slowing down, the couple he’s 65 and she’s 63 have reinvented themselves anew as entrepreneurs, with each starting a separate company.

In the husband’s case, it’s WeddingMusicWorks, which sells customized wedding CDs with music of his own composition; in the wife’s, it’s TravelKleen, which sells reusable headrest protectors for airline travelers grossed out by dirty seats.

“I did a great deal of traveling worldwide and realized that airplanes aren’t clean anymore,” said Arlene Rosenstein. “It bothered me a lot.”

Both companies hers about two years old, his just five months sell primarily online. And neither, according to their proprietors, has yet made a significant profit.

Yet the Rosensteins, who recently celebrated their 40th wedding anniversary, continue their labors of love. The CDs sell for $6 to $15, while the white polypropylene headrests sell for $8.95.

“We can’t live on the income yet,” said Jerry Rosenstein, who has no plans to retire from his CEO job anytime soon.

Is this the future the couple envisioned?

“There are lots of fun things you can do in life at any stage,” Arlene Rosenstein said. “We do this instead of watching TV.”