Liminal Longevity is a physician-led longevity medicine practice opening in Wilton, Connecticut, built for people who want to perform well, age well, and take a more proactive role in their health.

Most healthcare is designed to react to disease. Liminal was built around a different premise: the years before illness, injury, or decline are the years with the greatest opportunity to optimize.

Our membership-based model integrates longevity medicine, functional and integrative care, orthopedic and regenerative treatment, hyperbaric oxygen therapy, and personal training into one coordinated health protocol for each member.

Co-founded by Dr. Frank Hermantin, an orthopedic surgeon, and Dr. Jennifer Phelps, a physician specializing in integrative and functional medicine, Liminal treats longevity as a clinical discipline rather than a trend. Each member begins with comprehensive diagnostics, not a generic wellness questionnaire. From there, protocols are built around measurable hormonal, metabolic, musculoskeletal, cognitive, and performance markers that are tracked and adjusted over time.

Our services are organized around four core areas: longevity medicine, integrative and functional care, regenerative medicine, and hyperbaric oxygen therapy. These are supported by a dedicated personal training program for members who take their performance seriously and want to reduce the impact of injury, fatigue, and preventable decline.

Located at 493 Danbury Road in Wilton, Connecticut, Liminal Longevity serves Fairfield County and beyond. We are currently accepting founding members ahead of our 2026 opening.

Liminal Longevity

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Liminal Longevity

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