Habits that pay off long term

Not smoking, moving most days, drinking moderately and keeping close relationships are the habits most linked to a long, good life. Build them one at a time.

• Evidence: Some

The idea

Some choices matter more over 30 years than over 30 days. The best way to find out which ones is to follow people for a very long time and see who ends up healthy and content.

The Harvard Study of Adult Development does exactly that. One analysis followed 569 men, 237 college students and 332 young men from inner-city neighborhoods, from their teens for 60 years or until death. How well they were doing at 70 to 80 could be predicted from things measured before age 50. Seven of the predictors were at least partly under their control: not abusing alcohol, not smoking, a stable marriage, exercise, a healthy weight, how they coped with problems, and education [1]. Relationships matter in late life too. In a study of 81 older couples, feeling secure with a partner predicted greater life satisfaction two and a half years later [2].

Other large studies point the same way. In two US cohorts of more than 120,000 people followed for up to 34 years, five habits stood out: never smoking, a healthy weight, at least 30 minutes a day of moderate or vigorous activity, moderate drinking and a good diet. At age 50, women with all five were projected to live about 14 years longer than women with none, and men about 12 years longer [3]. Across 148 studies, people with stronger social relationships were 50% more likely to survive over the study periods [4].

These habits also help how you feel now, not just how long you live. Physical activity has a small but real link with wellbeing, mostly through more good moods [5].

How to use it

Treat this as a short list, not a long one. If you only work on a few things over the next few years, these are the ones with the best long-term evidence:

1. Don’t smoke. If you do, stopping matters more than anything else on this list.
2. Move most days. Half an hour of walking counts. For training plans, see liftgood.now. More on the basics in Movement.
3. Keep alcohol moderate. See Alcohol and caffeine.
4. Look after a few close relationships. See Maintaining friendships.
5. Sleep and eat reasonably well. sleepgood.now and eatgood.now cover these.

Then pick one and turn it into a habit, using the steps in How to build one habit at a time:

• Make it small and specific. “Walk for 20 minutes after lunch”, not “get fit”.
• Tie it to a fixed cue. Same time or same place each day.
• Expect about two months. In a study of 96 people, the time for a daily habit to feel automatic ranged from 18 to 254 days [6]. A 2024 review found medians of 59 to 66 days [7].
• Track it. A tick sheet works. The habit tracker does this offline.

Once a habit is automatic, it tends to keep going even when your motivation fades [8]. That is the point: you do the work for a couple of months, and the habit carries on with little effort for years.

Common mistakes

• Starting five habits at once. Each one needs attention for weeks. One at a time gives each a real chance.
• Giving up after a missed day. Missing one day didn’t noticeably slow habit formation [6][8]. Just carry on the next day.
• Picking something too big. Simple actions became automatic faster than more demanding routines [8].
• Ignoring people. It’s easy to focus on the gym and diet and let friendships drift. Relationships show up again and again in the long-term data.
• Expecting quick results. These habits pay off over years. Judge them by whether you’re still doing them in six months, not by how you feel after a week.

Evidence

Rated Some. The long-term studies are large and consistent, but they are observational. People who exercise and don’t smoke differ in other ways too, and the researchers can only adjust for some of them. The Harvard analysis followed only men, all from the same generation [1]. The habit-formation figures come from a small number of studies, most with a high risk of bias and self-reported measures [7].

Topics: Habits, Health, Relationships, Exercise, Long Term

Sources checked 4 October 2026. Spot a mistake? Tell us.