Daily SPF in your sixties: is it still worth it?

August 2, 2026

The short version

One randomised trial found 24% less skin ageing over four and a half years, measured as fine surface texture, not appearance. Everyone in it was under 55.
Nobody has randomised people over 65 to daily SPF. What it is worth at sixty-five is a judgement, not a finding.
Sunscreen use is linked to slightly lower vitamin D readings. Whether that matters is left open by the review that found it.
No trial has tested the sunscreen to vitamin D to weaker bones chain. Nobody has shown it and nobody has ruled it out.
Summer UV at Lauder in Central Otago ran about 41% above comparable North American sites in the early 2000s.

This page carries no product links and no recommendations. We sell skincare, so we are staying with what the trials measured.

What the ageing trial found

In Nambour, southeast Queensland, adults were randomly assigned to daily sunscreen or to their own discretion, from 1992 to 1996. The sunscreen was an SPF 15-plus, applied to the head, neck, arms and hands only.

The daily group showed 24% less skin ageing, with relative odds of 0.76 and a confidence interval of 0.59 to 0.98. It was funded by the National Health and Medical Research Council of Australia (Hughes, 2013).

The limits:

The outcome was skin surface microtopography, graded blind. That is fine texture, not appearance.
The confidence interval nearly touches 1, so the result is significant but borderline.
903 adults took part, all younger than 55, drawn from a community register of 1621.
The authors list missing outcome data and modest power as limitations.

Their conclusion: regular sunscreen use "retards skin aging in healthy, middle-aged men and women". Stretching that to the over-65s goes further than the data.

Skin cancer

The same participants were followed for skin cancer. We are not printing the rates: a shop that sells skincare is not the right place to present sunscreen as preventing disease. Their own words instead.

The 1999 report concluded that "cutaneous squamous-cell carcinoma, but not basal-cell carcinoma seems to be amenable to prevention through the routine use of sunscreen by adults for 4.5 years" (Green, 1999). Only cancers at the sites of daily application were analysed.

Ten years on, the authors concluded that melanoma "may be preventable by regular sunscreen use in adults" (Green, 2011). The numbers are small and that result was not conventionally significant, so the "may" stays in.

The vitamin D question

A 2025 systematic review pooled seven studies covering 9470 participants. Sunscreen use was associated with lower serum 25-hydroxyvitamin D, reported as a standardised mean difference of 2 ng/mL lower, confidence interval 1 to 3 (Gatta, 2025).

Four caveats:

A standardised mean difference is unitless, so do not read 2 ng/mL as a drop in your own blood level. That is how the paper prints it.
Heterogeneity was I-squared of 37%, which the authors call "not important". That sits in the moderate band.
The review leaves the health implications open. Our reading is that the effect looks modest, and that is our reading, not a finding.
Studies within it were mixed, and the effect was strongest in people who already had limited sun exposure.

The bone worry

The usual chain runs: sunscreen lowers vitamin D, low vitamin D weakens bones, so more falls and fractures. No randomised trial has tested it.

The closest New Zealand evidence is the Vitamin D Assessment trial in Auckland: 5110 adults aged 50 to 84, given monthly high-dose colecalciferol or placebo for 3.4 years. Falls showed a hazard ratio of 0.99 and non-vertebral fractures 1.19, neither significant (Khaw, 2017).

That tested tablets, not sunscreen. Its primary outcome was cardiovascular disease and most participants were not deficient to start with, so it settles nothing either way.

The other side of the ledger

A 2025 simulation funded through Cancer Australia modelled 20 years for New Zealand: about 1.2 million new cases from UV over-exposure against 0.08 million from under-exposure. Deaths ran the other way, 20,104 against 7136, and the authors say plainly that this depended on which definition of vitamin D deficiency was used (Collins, 2025).

It is a model, not observed data, but it cuts against a simple sun-avoidance message.

How New Zealand summer UV compared

Sixteen mid-latitude monitoring sites were compared, 15 in North America and one at Lauder in Central Otago. Peak UV Index at Lauder in 2003 exceeded comparable North American latitudes and altitudes by 41%, plus or minus 5%, with 2002 and 2004 the same (McKenzie, 2006).

Those are early-2000s measurements, not this summer, and the comparison is with North America, not the world.

What to do with this

This page carries no recommendations, as we said. It can only point you at the right conversations.

Take a changing mole or any skin cancer question to your GP, not to a shop.
Take supplements, blood levels and bone health to your GP too. Nothing cited here tells you what to swallow.
No study cited here compared summer-only sunscreen use against year-round use, so we cannot say which is better.

These trials ran in people younger than most of you reading this. What daily SPF is worth at sixty-five is a judgement rather than a finding, and that one is yours.

The Verdo team

Frequently asked questions

Is there randomised evidence that sunscreen slows skin ageing?

Yes, though it is narrower than it sounds. The Nambour trial found 24% less skin ageing in the daily sunscreen group over four and a half years, with relative odds of 0.76 and a confidence interval of 0.59 to 0.98 that only just excluded no effect. What was measured was fine skin surface texture graded blind, in 903 adults who were all younger than 55, so it cannot simply be assumed to hold in your sixties.

Does sunscreen lower vitamin D levels?

A 2025 review pooling seven studies across 9470 participants found sunscreen use was associated with lower serum 25-hydroxyvitamin D, and the authors said the health implications are still unclear. The pooled figure is a standardised mean difference printed in ng/mL, and a standardised mean difference is unitless, so do not read it as a drop in your own blood level. The effect showed up most in people who already had limited sun exposure.

If sunscreen lowers vitamin D, does that mean more fractures?

No randomised trial has tested that chain. The nearest New Zealand evidence, the Vitamin D Assessment trial in Auckland, gave 5110 adults aged 50 to 84 monthly vitamin D or placebo and found no significant difference in falls or non-vertebral fractures, but it tested tablets rather than sunscreen and most participants were not deficient. So nobody has shown the link, nobody has ruled it out, and your own bone health is a GP conversation.

Is New Zealand UV really higher than other places at the same latitude?

Against North American sites in summer, yes. Across 16 mid-latitude monitoring sites, 15 in North America and one at Lauder in Central Otago, peak UV Index at Lauder ran about 41% higher than at comparable North American latitudes and altitudes. Those readings are from 2002 to 2004, and the comparison is with North America rather than the whole world.

What did the sunscreen trials find for skin cancer specifically?

We have deliberately not printed the skin cancer rates, because a shop that sells skincare is not the right place to present sunscreen as preventing disease. The researchers concluded that squamous cell carcinoma, but not basal cell carcinoma, seems amenable to prevention through routine sunscreen use, and that melanoma may be preventable, with that melanoma result not conventionally significant and only cancers at the sites of daily application analysed. A mole or a patch of skin you are unsure about is a GP or dermatologist matter.

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