Infancy, in UK and Irish legal practice, refers to a person’s status as a minor (a child) before reaching the age of majority. It is not a technical term defined in modern core legislation, but is used descriptively, particularly in older case law, academic writing and some procedural contexts. In England and Wales, Scotland and Northern Ireland, the relevant concepts are now generally expressed in terms of “child”, “young person” or “minor”, with majority at 18 (subject to specific statutory regimes). In Ireland, similar terminology applies, with the age of majority also generally 18. Historically, “infancy” was important in contract, tort, property and civil procedure, affecting capacity to contract, sue or be sued, and liability. Those principles now largely operate through statutory frameworks (for example, capacity and limitation statutes, and children’s legislation) and modern judicial doctrine, but older authorities often still use “infant” for a person under 21 or later 18. In current practice, lawyers may encounter “infancy” in: older conveyancing precedents; trust and probate materials; limitation provisions referring to disability during infancy; and historic criminal or family law cases distinguishing children from adults.