Forget the fountain of youth — the future of longevity is your family doctor, according to the co-founder of Osler Health International

For Dr Tsin Uin Foong, longevity does not sit outside primary care, waiting to be discovered by the affluent and the curious. It begins in the doctor’s office, in the ordinary discipline of prevention, continuity and trust.

That conviction runs through how she practises and how she has helped shape Osler Health International, the Singapore clinic she co-founded and where she serves as chief medical officer. 

The company positions itself as a private healthcare practice that integrates primary care, longevity diagnostics and holistic wellness solutions, with services spanning routine GP care, lifestyle medicine, health screenings and advanced longevity assessments. 

Foong’s argument is not that longevity should replace primary care with something more futuristic. Quite the opposite. “By building upon the foundation of thoughtful primary care where disease management and preventive health have always co-existed, ‘longevity’ today brings the layer of precision and personalisation that science has brought us over time.” 

She describes it as a continuum: begin with a strong base, then move carefully into “more sophisticated precision testing and diagnostics”, then build a plan around “the six lifestyle medicine pillars” — sleep, exercise, nutrition, mental wellness, social connection and the avoidance of harmful substances — alongside supplements and recovery modalities where they make sense. 

One would observe that Foong does not speak like an evangelist for maximal optimisation. Rather, she sounds more like a physician trying to rescue patients from the exhausting modern belief that health must now be pursued through endless stacking.

Her patients, she says, often arrive after wandering through the thicket of screenings and tests that now fill the longevity market. What they want is less novelty than interpretation. “They want expert analysis, meaningful interpretation, and practical guidance on how to translate those insights into effective, sustainable changes.” That is why, she says, “we have fully embedded longevity within our primary care services.”

Progress, with caution

She has seen a discernible shift in Singapore. “We are delighted to see the mindset shift in Singapore,” she says, with the restrained satisfaction of someone who has spent years making a case that the culture is only now beginning to hear. “For years, Osler Health has championed lifestyle medicine and prevention, and it’s encouraging to see that message beginning to truly resonate.” 

One place she sees that most clearly is menopause care. Osler, she says, frames menopause “not simply as a condition to manage, but as a pivotal life stage — a window of opportunity to implement meaningful lifestyle changes alongside hormonal therapy where appropriate to future-proof her health.” 

Here, her case for prevention is neither dreamy nor abstract. “Globally, healthcare systems increasingly recognise that proactively addressing chronic disease is not only clinically sound but economically strategic.”

Early intervention, particularly in conditions such as obesity, makes sense before the body tips into “complex, multi-system disease”. She calls this “a strategic reframing of how we approach the problem”. 

The reward, in her telling, is broader than lower bills. “Investing in healthspan — rather than simply managing disease — yields economic dividends not only through reduced healthcare expenditure, but also by enabling longer, healthier, and more productive working lives.”

Still, she is too clear-eyed to pretend the field comes without tension. One of the gravest, she says, is access. Innovation is racing ahead through “advanced diagnostics, preventive therapeutics, and personalised interventions”, while public reimbursement models lag behind. 

Then there is the matter of speed. Longevity medicine attracts capital, attention and consumer appetite, all of which can distort judgment. “Rapid scaling can sometimes outpace the strength of the evidence base,” she warns. “That risks introducing interventions before we fully understand long-term outcomes, which challenges the core medical principle of first, do no harm.”

The doctor of the future

Ask Foong to look 10 years ahead, and her answer remains grounded. She sees “continuous health optimisation” shaped by longitudinal data, wearables, genomics, and earlier detection. She sees risk analysis growing more precise, and care plans becoming more personal.

But the most interesting part of her forecast concerns the doctor. “The physician’s role will also evolve — from reactive problem-solver to long-term health strategist.” 

Then comes the line that anchors everything she has said. “Importantly, primary care will remain the foundation. The most successful practices will not abandon primary care medicine, but rather will elevate it.”

The future, Foong suggests, may arrive with more biomarkers, more devices and more precision. But it will still depend on an old-fashioned medical idea: that good care begins by knowing the patient well enough to guide them before things go wrong.

Photographer: Angela Guo & Isabelle Cheah
Art direction: Fazlie Hashim
Stylist: Dolphin Yeo