The dunnock’s typical lifespan ranges from 15 years and 7 months to 26 years, with a maximum recorded lifespan of 20 years and 10 months, although its theoretical lifespan is between 7 years and 9 months and 11 years and 1 month. The species reaches sexual maturity from 9 months and 1 week to 1 year and 3 months. An embryo develops inside an egg, after which the young are nestlings that receive food from their parents for a period of 1 week and 3 days to 2 weeks. Following this, the young enter a stage of rapid growth, lasting from 1 to 3 months, during which they learn to fly and forage for food. The adult stage, when the species is capable of reproduction, lasts from 1 to 7 years.