How is Age Calculated?
Age is calculated from the date of birth to the reference date (today by default). The years, months, and days are computed correctly accounting for different month lengths and leap years.
Milestone Ages
In the UK, key age milestones include: 16 (can leave school, consent to medical treatment), 17 (can learn to drive), 18 (full adult legal rights, can vote and buy alcohol), 25 (full National Living Wage rate applies), 55 (currently the minimum pension access age, rising to 57 in 2028), and 66 (current State Pension age).