pakistani White Gold pigeon

A pigeon's normal lifespan in nature is about 3 to 4 years.
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Female pigeons can reach sexual maturity as early as 7 months of age. Pigeons build a flimsy platform nest of straw and sticks, put on ledge, under cover, often located on the window ledges of buildings. Eight to 12 days after mating, the females lay 1 to 3 (usually 2) white eggs which hatch after 18 days.
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During the night, the birds were allowed to sleep normally. ... If pigeons lose sleep when a predator is around, they can recover this lost sleep at a later time by sleeping more deeply.

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Pigeons don't fledged (leave the nest) until they are almost adult-sized and those that don't know what to look for can't tell a baby pigeon from an adult one. In the case of Wood pigeons (the fat ones that you see on your lawn)

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A pigeon that leads a pampered life might make it to age 15 before croaking. But most rarely live that long – five years in the wild is typical.