UK population by age 2023

In 2023, there were estimated to be 956,116 people who were aged 35 in the United Kingdom, the most of any age in this year. The two largest age groups during this year were 30-34, and 35 to 39, at 4.7 million and 4.64 million people respectively. There is also a noticeable spike of 693,679 people who were aged 76, which is due to the high number of births that followed in the aftermath of the Second World War.

Over one million born in 1964

In post-war Britain, there have only been two years when the number of live births was over one million, in 1947 and in 1964. The number of births recorded in the years between these two years was consistently high as well, with 1955 having the fewest births in this period at 789,000. This meant that until relatively recently, Baby Boomers were the largest generational cohort in the UK. As of 2022, there were approximately 13.76 million Baby Boomers, compared with 14 million in Generation X, 14.48 million Millennials, and 12.9 million members of Gen Z. The youngest generation in the UK, Generation Alpha numbered approximately 7.5 million in the same year.

Median age to hit 44.5 years by 2050

The population of the United Kingdom is aging at a substantial rate, with the median age of the population expected to reach 44.5 years by 2050. By comparison, in 1950 the average age in the United Kingdom stood at 34.9 years. This phenomenon is not unique to the United Kingdom, with median age of people worldwide increasing from 23.6 years in 1950 to a forecasted 41.9 years by 2100. As of 2022, the region with the oldest median age in the UK was South West England, at 43.9 years, compared with 35.9 in London, the region with the youngest median age.

Population of the United Kingdom in 2023, by age

Characteristic	Estimated mid-year population
0	667,182
1	712,250
2	709,269
3	734,023
4	749,283
5	758,470
6	776,432
7	799,371
8	793,617
9	798,031
10	817,504
11	839,089
12	840,153
13	829,602
14	823,939
15	831,564
16	800,948
17	788,039
18	788,696
19	802,221
20	800,449
21	801,197
22	804,176
23	830,748
24	860,972
25	869,693
26	887,804
27	873,861
28	886,608
29	909,781
30	912,190
31	940,924
32	952,785
33	949,670
34	944,629
35	956,116
36	934,117
37	927,817
38	923,763
39	894,780
40	894,975
41	890,405
42	897,957
43	899,806
44	863,083
45	801,649
46	786,525
47	804,582
48	819,815
49	830,671
50	863,027
51	895,933
52	929,430
53	906,981
54	927,507
55	925,298
56	929,842
57	925,224
58	929,166
59	915,735
60	893,200
61	869,924
62	836,792
63	802,248
64	779,505
65	756,288
66	721,862
67	692,329
68	661,675
69	657,555
70	642,440
71	617,545
72	616,186
73	618,149
74	626,139
75	651,332
76	693,679
77	521,896
78	494,916
79	481,492
80	435,038
81	377,313
82	324,498
83	322,307
84	304,156
85	279,537
86	248,142
87	218,611
88	189,988
89	159,374
90*	120,860
91*	103,030
92*	84,940
93*	67,730
94*	51,180
95*	38,080
96*	28,120
97*	19,960
98*	13,760
99*	9,230
100*	6,070
101*	3,880
102*	2,390
103*	1,440
104*	510
105+*	560

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Release date

October 2024

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Region

United Kingdom

Survey time period

2023

Supplementary notes

This statistic is using original data from the Office for National Statistics and includes copyright material from © Crown, licensed under the Open Government License v3.0.

*Individual age groups for those aged 90 only include the population of England and Wales and are taken from a separate report: "Mid-year population estimates of the very old, including centenarians: England and Wales"

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