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About Us

Elevating Health, Vitality, and Longevity—One Individual at a Time

At GenAge Center, we believe wellness is personal, and aging should be optimized—not feared. Our practice in Ada, Michigan, serves the greater Grand Rapids community with science-based, individualized wellness programs designed to restore balance, improve vitality, and empower lifelong health.

From hormone therapy to nutrition coaching, body composition analysis, and functional fitness, our experienced team delivers whole-person care in a warm, collaborative environment.

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Our Mission

To help our clients and our colleagues achieve their desired performance, empowerment, and vitality.

Our Values

  • Serve our clients and one another in accordance with the Golden Rule.
  • Embody the highest professional standards.
  • Optimize for individual outcomes.
  • Apply comprehensive approaches through teamwork and community.
  • Explore and apply advancements with openness and rigor.

Meet the GenAge Team

Dr. Hyung Kim, MD, MBA, FACP

Center Director & Founder

Triple Board-certified in Internal Medicine, Anti-Aging & Regenerative Medicine, and Lifestyle Medicine. Johns Hopkins–trained, with an MBA from the University of Michigan. Former Senior Associate Dean at MSU and President of Mercy Health Saint Mary’s. Focused on personalized, performance-driven care.

Jen Vermeulen

Board-Certified Adult Nurse Practitioner

Brings 19 years of clinical experience in chronic disease and weight management. Jen is known for building strong, trusted relationships and helping women regain control of their health.

Joyce Stoughton-Kim

Director of Client Services

Sales leader and artistic visionary with a career in program development. Award-winning ballroom dancer, author, and inductee of the National Hustle Dance Hall of Fame. Joyce also serves on the Board of Kent County Toys for Tots.

Jessica Randall

Client Services & Lifestyle Manager

Certified Functional Medicine Health Coach with a background in Psychology and Family Studies. Jessica blends behavior change science and holistic education to guide clients toward lasting lifestyle improvement.

Autumn Knapp

Licensed Massage Therapist & Movement Educator

With over 6 years of massage experience and 15+ years in movement teaching, Autumn is also certified in Gyrokinesis®, Gyrotonic®, personal training, and holistic health coaching. She blends manual therapy with lifestyle coaching for total-body support. Outside the clinic, she’s active in community theater and costume design.

Atlas Barrie

Fitness Specialist & Personal Trainer

Certified by the National Academy of Sports Medicine, Atlas has a B.S. in Allied Health and experience training athletes, professionals, and bodybuilders. He focuses on sustainable fitness routines grounded in sleep, nutrition, and recovery. In his spare time, he’s a competitive bodybuilder and dark chocolate aficionado.

Gabrielle Partlo

Clinical & Client Services Associate

Gabrielle will be earning a Bachelor of Science in Human Biology with a minor in Bioethics from Michigan State University. She is certified as a patient care technician and has worked with patients both in the hospital and in an assisted living facility. At Michigan State, she is involved on campus with clubs and volunteering, in addition to working as an Undergraduate Learning Assistant. After graduation, she plans to apply to Physician Assistant programs. Outside of class and work, Gabrielle enjoys spending time with family and friends, going for walks, and volunteering with kids.

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Liz Bissell

Registered Dietitian & Nutrition Specialist

Specialist in women’s health and hormone nutrition. Holds degrees from MSU and Benedictine University. Offers food-first, practical guidance for sustainable change. Passionate about gardening, herbalism, and whole-body vitality.

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