List of Portuguese monarchs by age at ascension to the throne
In 1578, after the death of his grand-nephew 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)
Peter IV (I of Brazil)
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)
Charles I
26
21
28 September 1863
19 October 1889
20
14
Manuel I
25
359
31 May 1469
25 May 1495
21
31 (30)
Michael I
25
259
26 October 1802
11 July 1828
22
33 (32)
Louis 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 (III of Spain)
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)
Peter V
16
60
16 September 1837
15 November 1853
29
21 (20)
Philip III (IV of Spain)
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
