Stewart’s net worth stands at a reported $400 million — here’s what can be learned from her example. Embrace reinvention.

Spoiler alert: it’s not for the faint of heart. RELATED: Martha Stewart Says She’ll Keep Posting "Thirst Traps" at 81: "I Don’t Think About Age." Her favorite low-impact exercise is pilates.

So, what about TV personality, author, and hosting queen, Martha Stewart? The first thing Stewart ... having graced the magazine at age 81. Read more: Why Michael Voltaggio Calls The French ...