Free tool · no sign-up
Small pets pack a whole life into a few short years — and each species ages on its own clock. Enter your pet’s age to see its life stage, how far through its typical lifespan it is, and what to start watching for as it gets older.
Typical lifespan: 1.5–2 years · senior from about 1.25 years (approx.)
In the senior years: Watch for lumps and weight change. As the most diabetes-prone pet hamster, the strict no-sugar diet matters at every age.
Source: Merck Veterinary Manual — Description of hamsters · full campbell’s hamster care guide →
Typical lifespan: 15–20 years · senior from about 10 years (approx.)
In the senior years: A genuinely long-lived pet — dental disease is the main age-related problem, so watch for drooling, dropped food and weight loss. Keep them cool and on a hay-first diet for life.
Source: RSPCA — Creating a good home for chinchillas · full chinchilla care guide →
Typical lifespan: 2–3 years · senior from about 1.75 years (approx.)
In the senior years: Watch for lumps, weight loss and breathing changes; keep sugar low as it ages.
Source: Merck Veterinary Manual — Description of hamsters · full chinese hamster care guide →
Typical lifespan: 6–8 years · senior from about 5 years (approx.)
In the senior years: Watch for diabetes and cataracts (never any sugar or fruit) and dental disease. A long-lived colony rodent, so keep its companions into old age.
Source: RSPCA — Creating a good home for degus · full degu care guide →
Typical lifespan: 5–7 years · senior from about 4 years (approx.)
In the senior years: Keep it warm and dry into old age; the tail’s thickness is a health gauge, so a thinning tail warrants a vet check.
Source: Royal Veterinary Center (exotics clinic) — Duprasi care sheet · full fat-tailed gerbil care guide →
Typical lifespan: 6–8 years · senior from about 4 years
In the senior years: Adrenal disease and insulinoma become common from around 3–4 years, with true geriatric age at 5+. Ask about senior bloodwork and watch for hair loss, hind-end weakness and low-blood-sugar episodes.
Source: dvm360 — Exotic mammal geriatrics · full ferret care guide →
Typical lifespan: 3–4 years · senior from about 2.5 years (approx.)
In the senior years: Watch for scent-gland and skin tumours and, in some lines, seizures; keep an eye on the ever-growing teeth and provide plenty to gnaw.
Source: RSPCA — Creating a good home for gerbils · full gerbil care guide →
Typical lifespan: 5–8 years · senior from about 4 years
In the senior years: Watch for dental disease, gradual weight loss, arthritis and (in females) ovarian cysts. Weigh weekly and see a vet for any drop in appetite.
Source: The Veterinary Nurse — The geriatric guinea pig · full guinea pig care guide →
Typical lifespan: 1.5–3 years · senior from about 1.5 years (approx.)
In the senior years: Watch for lumps, weight loss and breathing changes; Syrians can develop heart failure with age. Of the pet hamsters, Roborovskis tend to live longest.
Source: Merck Veterinary Manual — Description of hamsters · full hamster care guide →
Typical lifespan: 3–5 years · senior from about 3 years (approx.)
In the senior years: Watch for Wobbly Hedgehog Syndrome (progressive wobbliness), cancer, dental disease and obesity — and keep the environment reliably at 24–29°C.
Source: Merck Veterinary Manual — Management of Hedgehogs · full hedgehog care guide →
Typical lifespan: 1–2 years · senior from about 1.25 years (approx.)
In the senior years: Watch for tumours and respiratory disease; keep the enclosure clean and low-dust, and see an exotic vet for any lump or laboured breathing.
Source: Merck Veterinary Manual — Mice and Rats as Pets · full mouse care guide →
Typical lifespan: 8–12 years · senior from about 5 years
In the senior years: Senior age depends on breed size — large breeds from about 4 years, medium ~6, and small/dwarf breeds ~8 (≈5 is a rough average). Watch for dental disease, arthritis and gut slow-downs; an arthritic rabbit that grooms less is prone to flystrike, so check its rear end daily. Switch to twice-yearly vet checks.
Source: Rabbit Welfare Association & Fund — Caring for senior rabbits · full rabbit care guide →
Typical lifespan: 2–3 years · senior from about 1.5 years
In the senior years: The high-risk stage: watch closely for mammary and pituitary tumours, hind-leg weakness and respiratory disease. A quick weekly hands-on check and weigh-in catches problems early.
Source: dvm360 — Exotic mammal geriatrics · full rat care guide →
Typical lifespan: 3–3.5 years · senior from about 2 years (approx.)
In the senior years: The longest-lived pet hamster. Watch for lumps, weight loss and slowing down; keep offering the big solid wheel it loves for as long as it uses it.
Source: Merck Veterinary Manual — Description of hamsters · full roborovski hamster care guide →
Typical lifespan: 12–15 years · senior from about 8 years (approx.)
In the senior years: A long-lived exotic — watch for dental disease, obesity and metabolic bone disease, all of which trace back to diet. Keep the colony together into old age.
Source: Merck Veterinary Manual — Providing a Home for a Sugar Glider · full sugar glider care guide →
Typical lifespan: 2–3 years · senior from about 1.75 years (approx.)
In the senior years: Watch for lumps, weight loss, breathing changes and signs of heart failure (a Syrian breathing fast or turning bluish needs a vet).
Source: Merck Veterinary Manual — Description of hamsters · full syrian hamster care guide →
Typical lifespan: 1.5–2 years · senior from about 1.25 years (approx.)
In the senior years: Watch for lumps and weight change, and stay strict on the no-sugar diet — dwarf hamsters are diabetes-prone throughout life.
Source: Merck Veterinary Manual — Description of hamsters · full winter white hamster care guide →
Life stages are a guide, not a verdict — individuals vary. A “senior” label just means it’s time for closer monitoring and more frequent vet checks, not that anything is wrong. Ages marked “approx.” are derived from the typical lifespan where no authority publishes a fixed threshold.
It varies hugely by species, because lifespans do. A rat is entering its senior years by about 18 months, a rabbit around 5 years, a guinea pig around 4, and a ferret around 4 (with true geriatric age at 5+). Longer-lived species like chinchillas (15–20 years) and sugar gliders (12–15 years) aren’t senior until much later. This tool gives the sourced threshold where an authority publishes one, and an approximate age derived from the typical lifespan otherwise.
It’s a fun idea but not a reliable one — small pets don’t age on a simple fixed multiplier, and a bad conversion can be misleading. What actually matters for care is the life stage (growing, adult, or senior) and how far through its typical lifespan your pet is, because that’s what tells you when to start senior vet checks and what to watch for. That’s what this tool shows instead.
Different species have different age-related risks — tumours and hind-leg weakness in rats, dental disease and arthritis in rabbits and guinea pigs, adrenal disease and insulinoma in ferrets, diabetes and cataracts in degus. Across the board, senior small pets benefit from more frequent (often twice-yearly) vet checks, regular weigh-ins, easier access to food, water and hides, and a close eye on appetite and mobility.
The typical lifespan for each species comes straight from our fact-checked care sheets (sourced from RSPCA, PDSA, the Merck Veterinary Manual and veterinary geriatric guidance). It’s a typical range for a well-kept pet, not a guarantee — individuals vary, and good diet, housing and vet care push toward the top of the range.
