If you're thinking about keeping millipedes, lifespan is one of the first questions to ask. The short answer is that pet millipede lifespan varies by species and by whether the animal is juvenile or adult when you buy it. That matters because it affects how long you can expect to keep the millipede and whether the species suits your expectations.

How millipede lifespan varies

Millipedes are soil-dwelling detritivores, which means they live in and feed on decaying organic material in the substrate. In captivity, their lifespan is closely tied to the conditions they are kept in, but there is still no single lifespan that applies to every species.

When people ask how long pet millipedes live, they are usually asking two different things:

• How long does the species usually live?


• How much of that lifespan will I actually get if I buy one now?

Those are not the same question. A juvenile may stay with you for much longer than an adult, while a mature millipede may already have used a large part of its life cycle by the time you buy it. For a fuller explanation of the stages involved, see What Is the Millipede Life Cycle? and How Long Do Millipedes Take to Grow?.

Why the topic matters

Lifespan affects the buying decision directly. The age of the millipede determines how long you are likely to have it, and species choice affects whether it fits your setup and your expectations.

Some keepers want a long-term animal they can enjoy for years once the enclosure is established. Others prefer a species that matures more quickly or simply suits a particular look or size. Either approach can work, but different species are suited to different keepers. If you want help narrowing down your options, start with the Millipede Species Guide.

Useful context for keeper expectations

The age of the animal you acquire has a big influence on how long it will stay with you. Buying a juvenile gives you more of its life, while buying an adult usually means a shorter period of ownership but a more mature-looking animal from the start.

That is why it helps to think about your goals before buying. Do you want to watch the animal grow, or do you mainly want a settled adult? Are you choosing for appearance, size, visibility or long-term ownership? Those questions are often more useful than looking for one exact lifespan figure.

If you are new to the hobby, it is worth reading Millipede Beginner & Buyer Guides and How to Start Keeping Millipedes. A stable setup with deep organic substrate, leaf litter, suitable moisture and shelter gives millipedes the conditions they need to settle, feed and live naturally.

What affects lifespan in captivity?

Species differences are the biggest factor, but day-to-day care also matters. Millipedes rely on a stable environment, and poor conditions can shorten the time they stay healthy.

• Species choice: different millipedes have different natural lifespans and growth rates.


• Age at purchase: a juvenile, subadult or adult will each give you a different length of ownership.


• Enclosure setup: deep substrate, leaf litter, cover and the right moisture levels help them live naturally.


• Diet: millipedes feed on decaying organic matter, so an appropriate diet matters.


• Stability: sudden changes, rough handling and unnecessary digging can make life harder for them.

It is also worth remembering that long-lived does not always mean often seen. Many millipedes spend a lot of time below the surface, and that is normal. A healthy animal may be hidden for long periods, especially while settling in or when conditions encourage burrowing.

In short

There is no single answer to how long pet millipedes live. Lifespan depends mainly on species and on whether you buy a juvenile or an adult. The best next steps are to choose a species that suits your expectations and then prepare the enclosure properly.

For help comparing options, use the Millipede Species Guide and our Millipede Beginner & Buyer Guides. If you are ready to set up, How to Start Keeping Millipedes is the next useful read.