Oldest combat aircraft still in service

Just thinking about the oldest combat aircraft still serving. My guess it would be
one of the AC-47 gunships. What about the following?
Argentine AF Mirage IIIC 1962/63?
Bolivian T-33 mid 1950s
Singapore AF A-4S [conveted A-4C] 1959?
Iranian AF F-4D and F-5A/B 1966?
Lebanon AF Hunter ?
USAF B-52H 1960
Spainish AF SF-5B late 1960s
Israeli AF TA-4H/J ?

Any more?