The amano shrimp is bought as algae crew and kept, often unexpectedly, as a long-term resident, so its lifespan is worth planning around rather than discovering by surprise.
The typical span: two to three years
Most amano shrimp live about 2 to 3 years in a home aquarium. In a mature, stable tank with constant grazing and no predators worrying them, individuals sometimes continue to 4 or even 5 years, growing noticeably large and, in females, carrying the saddle of developing eggs for long stretches. Part of the confusion about their lifespan is that shop shrimp are usually sold at an unknown age, already part-grown, so a keeper's two years with a shrimp may be the second half of a longer life rather than the whole of it. Judge a shrimp less by the calendar and more by its behaviour: an active, constantly picking adult that moults cleanly and feeds boldly is thriving at whatever age it happens to be.
Stability is what buys the extra years
Amano shrimp tolerate a fair range of water, but they age badly in water that swings. Sudden temperature shifts, a large water change with very different parameters, or an ammonia spike in an immature tank can kill a shrimp that would otherwise have grazed on for years. Acclimate new shrimp slowly, keep the tank's routine boringly regular, and be cautious with anything added to the water: copper-based treatments are a classic accidental killer of aquarium shrimp, and even plant fertilisers deserve a label check before they go into a shrimp tank. A tight lid matters too, because amanos are capable climbers and a shrimp found dried on the floor has ended a multi-year life in a single night's exploring.
Moulting, hiding, and the vulnerable days
Growth happens by moulting, and older shrimp moult less often and recover more slowly than youngsters. After shedding, a shrimp hides while its new shell hardens, and tankmates that pick at a soft, stationary shrimp can injure or kill it, so dense plant cover, moss, and caves are lifespan equipment, not decoration. Leave shed skins in the tank for a day or so, as shrimp often eat them to reclaim minerals. A shrimp that has failed mid-moult, visible as a stuck, split shell with the animal unable to free itself, is an emergency tied usually to water mineral balance rather than age, and it is one of the few shrimp problems where the keeper's water records genuinely help work out what went wrong.
Feeding a grazer across its whole life
Amanos earn their keep on algae and biofilm, but a very clean tank can underfeed a group of large adults. Supplement with algae wafers, blanched vegetables, and specialised shrimp foods a few times a week, and watch that food reaches the bottom before fish intercept it all. Females carrying pale eggs under the tail will release larvae that cannot survive in fresh water, which is normal and not a failure on the keeper's part; the eggs are simply part of adult life in the aquarium. A shrimp that stops grazing, sits exposed and still in the open, or loses its usual boldness at feeding time is showing a change worth investigating against recent water changes, new additions, or treatments used in the tank.
Across a multi-year life a shrimp may see several tanks and tankmates, and KinsLe Pet Passport keeps its water preferences, moult notes, and treatment warnings in one portable packet, so nothing important about its care is lost between setups.