The house sparrow’s typical lifespan ranges from 17 years and 3 months to 28 years and 9 months, with a maximum recorded lifespan of 23 years, and a theoretical lifespan between 16 years and 2 months and 20 years and 10 months. The species reaches sexual maturity from 3 weeks and 3 days to 6 weeks and 1 day; the young’s eyes open between 4 and 5 days of age, during the “Embryo” stage when the embryo develops inside an egg. The “Chick” stage follows, where the chick is in the nest and fed insects and seeds by its parents for a duration of 2 weeks to 2 weeks and 3 days. The “Adult” stage begins when the bird is capable of reproduction and lives independently, lasting from 10 months to 8 years and 3 months.