Your stag weekend may need ethics approval

Dear parents and carers, Mr Daniel Pryce will not be teaching Year 5 for the first three days of next week while his biological age returns to within the band agreed with the school's wellness provider. Letters of this kind could become routine under a subscription tier being trialled by longevity platforms, which would allow a stag party to register itself in advance as a supervised ageing event. The groom's employer would be informed automatically, and so, it appears, would everyone else.

Direct-to-consumer tests that estimate a person's biological age from epigenetic markers are now widely sold, and longevity clinics and apps increasingly package blood panels, wearables and coaching into tiered subscriptions rather than one-off purchases. Employer wellness programmes have expanded and often draw on data from wearable devices, sometimes with a link to insurance premiums or sick-pay arrangements. Stag and hen parties have grown into longer, more expensive and often international events with organised itineraries, while a counter-trend of sober and wellness-themed stag weekends has emerged. Schools routinely write to parents to explain staff absences and cover arrangements.

Under the scheme, one of the larger longevity subscription services would add an Occasion tier, priced per head and billed to the best man. Each member of the party would post a saliva sample in the week before departure and a second on the Wednesday after, and the difference between the two epigenetic readings would be logged as elective ageing, a category the platform would exclude from the participant's employer wellness score. The best man would be designated cohort lead. The groom would be designated, in the platform's own terms of service, the primary endpoint.

The tier would require a control group. Two members of every party would be selected by the platform's algorithm rather than by the best man, to avoid what the documentation calls selection bias and what the best man calls picking Gareth. Controls would remain sober for the duration, wear a wrist sensor and receive a forty per cent discount. Tom Wexley, 31, who would be assigned control status for his own brother's weekend in a coastal town, called the arrangement fair in principle. “My data is anonymised,” he said. “I am also the only man in the minibus holding a bottle of water.”

The letter to parents follows from the employer side of the arrangement. Staff wellness subscriptions are increasingly bundled with sick-pay insurance, and under the scheme a school on the premium tier would receive an automatic notification whenever a member of staff's biological age moved outside an agreed tolerance band. The head teacher would then be required to arrange recovery cover and to tell families the reason, since the platform's terms treat a deviation as a declared absence rather than an illness. The letter's second paragraph would therefore explain that Mr Pryce was not unwell but was, for administrative purposes, 3.2 years older than on Friday morning.

The weekend's itinerary would be submitted in advance as a protocol. Go-karting would be entered as a controlled physical stressor, the third venue of the evening as a scheduled exposure and the fourth as a deviation, which the cohort lead would have ninety minutes to log in the app with a reason. Surprise activities could remain a surprise to the groom, who would be described in the paperwork as blinded. The best man would not be blinded, which the platform would classify as a single-blind design, and the groom's fiancée, who would have booked the hotel, would appear on the form as the sponsor.

Results would arrive on the Wednesday, reported in elective years to one decimal place. Where the groom's figure exceeded his employer's band, the platform would offer amortisation, under which other members of the party could each accept a share of his ageing onto their own record. Amortisation would be voluntary. The app would display who had declined. Marcus Odell, 34, who would take on 0.4 of a year for a friend he has known since school, put it plainly. “I'd have taken 0.6 if he'd asked. He didn't ask. I've made a note.”

A Legacy tier would allow the party's data to be contributed to a longitudinal study in return for a certificate suitable for framing. Because the weekend would then constitute research, it would require review by an independent ethics panel, a task the platform would outsource to a rolling online committee that assesses stag itineraries in an average of four minutes. Requests for amendment would be common. A statement from the platform's head of participant welfare would confirm that the committee held no view on whether a party should do shots, only on whether the number of shots had been justified in the study design.

The wedding itself would not be covered, and a separate Ceremony tier would be announced in due course. Mr Pryce would return to Year 5 on the Thursday, within band, and would be asked by a pupil what a control group is. He would explain that it is the person who has to remember what happened. The school's letter would close by thanking parents for their understanding and by confirming that the supply teacher's biological age had been verified in advance, and that the school had it on file.