India, Nov. 13 -- A 76-year-old billionaire has a team of five people overseeing his daily routine and undergoes dozens of medical tests as part of his efforts to slow ageing. American real-estate investor Larry Connor follows a closely monitored approach to maintaining his physical and mental fitness.

His routine reflects the growing interest in longevity among wealthy individuals, some of whom are spending large sums on healthcare, medical monitoring and treatments in the hope of living longer.

Connor's office in Miamisburg, Ohio, regularly hosts strength trainers, yoga instructors and massage therapists. Around 15 professionals, including doctors and performance coaches, help him maintain his health and fitness.

His business also ha...