List of Portuguese monarchs by age at accession to the throne
In 1578, after the death of his grandnephew Sebastian, Cardinal Henry of Portugal, aged 66 became the oldest man to become King of Portugal.
In 1557, 3-year-old Prince Sebastian became the youngest King of Portugal ever.
This is a list of Portuguese monarchs' ages at the time they became kings or reigning queens. For Maria II of Portugal, who was queen during two non-consecutive terms, the age at the start of the first term is given. The median age for a monarch to ascend to the throne is 28 years and 296 days.
OO = Order of OfficeY = YearsD = DaysR = Rank
17
Cardinal-King Henry
66
185
31 January 1512
4 August 1578
1
19 (18)
Philip I (II of Spain)
53
331
21 May 1526
17 April 1581
2
18
António, Prior of Crato
48
206
1531
24 July 1580
3/4
28 (27)
John VI
48
312
13 May 1767
20 March 1816
4/3
27 (26)
Maria I
42
97
17 December 1734
24 March 1777
5
11
Edward
41
287
31 October 1391
14 August 1433
6
5
Afonso III
38
183
5 May 1210
4 November 1248
7
8
Peter I
37
30
8 April 1320
8 May 1357
8
22 (21)
John IV
36
257
19 March 1604
1 December 1640
9
26 (25)
Joseph I
36
55
6 June 1714
31 July 1750
10
24 (23)
Peter II
35
139
26 April 1648
12 September 1683
11
7
Afonso IV
34
365
8 February 1290
7 February 1325
12
2
Sancho I
31
25
11 November 1154
6 December 1186
13
1
Afonso I Henriques
30
0
25 July 1109
25 July 1139
14
10
John I
27
360
11 April 1357
6 April 1385
15
29 (28)
Pedro IV
27
149
12 October 1798
10 March 1826
16
3
Afonso II
26
338
23 April 1185
26 March 1212
17
13
John II
26
118
3 May 1455
29 August 1481
18
25 (24)
John V
26
48
22 October 1680
9 December 1706
19
34 (33)
Carlos I
26
21
28 September 1863
19 October 1889
20
14
Manuel I
25
359
31 May 1469
25 May 1495
21
31 (30)
Miguel
25
259
26 October 1802
11 July 1828
22
33 (32)
Luís I
23
11
31 October 1838
11 November 1861
23
9
Ferdinand I
21
79
31 October 1345
18 January 1367
24
20 (19)
Philip II
20
152
14 April 1578
13 September 1598
25
15
John III
19
189
7 June 1502
13 December 1521
26
35 (34)
Manuel II
18
78
15 November 1889
1 February 1908
27
6
Denis
17
130
9 October 1261
16 February 1279
28
32 (31)
Pedro V
16
60
16 September 1837
15 November 1853
29
21 (20)
Philip III
15
357
8 April 1605
31 March 1621
30
4
Sancho II
15
260
8 July 1207
25 March 1223
31
23 (22)
Afonso VI
13
77
21 August 1643
6 November 1656
32
30 (29)
Maria II
7
28
4 April 1819
2 May 1826
33
12
Afonso V
6
237
15 January 1432
9 September 1438
34
16
Sebastian
3
142
20 January 1554
11 June 1557
35
See also
List of Portuguese monarchs
List of Portuguese monarchs by longevity
