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In 2025, there were approximately ** men in the armed forces of the United Kingdom, and * women. The reduction in personnel witnessed by the British Armed Forces recently is the result of a conscious attempt by previous UK governments to cut costs and modernize the military. This policy was informed by the 2010 Strategic Defence and Security Review, which, among other things, sought to replace many full-time regulars with reservists, and to end the UK’s permanent deployment in Germany. 

Cuts across air land and sea

While the army has born the brunt of these cuts to personnel, all branches of the armed forces have also had to contend with the same issue. While the share of GDP spent on defence has recently started to increase, over the long term, the UK has spent far less on defence since the end of the Cold War. In 2022/23, the UK spent *** percent of GDP on defence, slightly above the current minimum NATO requirement of *** percent of GDP. Recent geopolitical events, such as the Russian invasion of Ukraine, have led to renewed calls for increased defence spending, with the new NATO target of 3.5 percent agreed at the 2025 summit. 

Age of personnel

In 2025, the average age across all ranks and branches in the UK armed forces was **. This was the average age for all branches of the armed forces, except for the RAF, which had an average age of **. During the same year, there were approximately * people aged between 18 and 29 in the armed forces, compared with * people aged between 30 and 49. In this year, the number of people aged 50 or over in the Armed Force was *.