My grandpa stayed sharp, social, and full of purpose into his 90s. The secrets to his successful retirement are simple.

My 90-year-old grandpa worked a part-time job for 30 years after he retired. He said it helped him stay healthy, among other perks.

Allie Hubers

• My grandpa worked during retirement, which he says helped him stay active and find purpose.
• Rather than sitting at home, he learned new tech, solved problems, and interacted with new people.
• He inspires me to keep challenging myself and stay active, so I can live a long, rich life like him.

Most people look forward to relaxing during retirement...