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

• 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, but not my grandpa.

After working for 40 years at the county's Department of Agriculture, my grandpa started a part-time job at a local towing company. He didn't have to, financially, but he wanted to stay busy.

What started as a fun retirement gig evolved into three more decades of dedicated work. Even into his 90s, he didn't fully quit working, and that's just how he liked it.

He credited his 70 years of work — and a good shot of bourbon every day — for keeping him strong, healthy, and quick-witted for so long after he retired.

As I get older, he's inspired me to live my life the same way (though maybe without the daily bourbon).

Work has always been important to my grandpa, but it became an especially big deal in retirement

After seeing other retired friends lose their motivation and purpose, my grandpa was determined to keep busy.

He's always been on the go, so it's not surprising his idea of retirement never involved sitting at home every day. "Working is in my blood," he's told me, and it keeps him sane.

For 30 years, my grandpa worked a flexible schedule as a dispatcher at the local towing company — a retirement job he simply loved. He handled everything from customer service to bookkeeping and vehicle titling.

As someone who's always thrived on routine, his consistent schedule kept him mentally sharp and engaged. He maintained a meticulously organized desk and took pride in his work, always arriving at least 10 minutes early to his shifts.

With his witty sense of humor and larger-than-life laugh, my grandpa loved being social at his job. Meeting with coworkers and new customers also allowed him to connect and engage with others on a daily basis.

By staying busy, he kept himself feeling young and healthy

They say, "Age is but a number," and that's certainly true for my grandpa. Even at 90, most people would guess he was only in his 70s, thanks to his energy, mobility, and stamina.

Genetics aside, he probably seemed younger than he was because he found ways to keep his mind sharp. At work, he continued to challenge himself, as his dispatching job required quick-thinking and constant problem-solving.

He loved learning new technology and felt proud that he was a knowledgeable employee who could be counted on. To me, he proved that age never needs to limit your growth.

My grandpa was in great shape for most of his life, and he often credits his longevity to staying active with his job and getting out of the house often over the last 30 years.

Plus, his good health allowed him to continue doing other things he loved, such as golfing with my grandma, snowbirding in Florida every winter, and spending summer weekends at the lake.

I've learned the importance of continuing to find fulfillment and stay challenged in life

Though many dream of never working again after leaving their full-time career, I already know I'll follow in my grandfather's footsteps.

Whether it's a hobby, career, or volunteer work, I've seen firsthand how important it is to keep prioritizing what gives your life meaning and joy as you age.

In many ways, working a few days each week allowed my grandpa to keep growing while giving him a renewed sense of pride and purpose in life.

His willingness to embrace new skills and stay involved in his community, even in retirement, has inspired me to approach my life the same way.

Not to mention, being active in retirement certainly contributed to his long life of health and happiness. I can only hope to still be traveling and cruising when I'm 90 — just like my grandpa did!

His example has taught me that living a meaningful life doesn't come from slowing down. Instead, fulfillment comes from challenging yourself, refusing to grow complacent, and finding ways to keep your mind and body active.

But more than anything, I want his life lessons to be passed down as our family legacy — one defined by purpose and never giving up on yourself.

Read the original article on Business Insider