From all the reading I have done that average is about 15 years maybe a little more. Although some in captivity can live well beyond that.

Congrats your old boy definintely has earned his senior citizens card.
-----
BigT
There is a difference between ignorance and stupidity. The ignorant can be taught, stupidity is beyond our control.
1.2 P. M. Melanoleucus B/W N. J. Northern Pines
1.2 P. D. Deppei Mexican Pines
2.2 P. L. Lineaticollis Linis or Lined Pines
1.2 P. M. Lodingi Black Pines
1.2 P. d. deppei Mex. pines
2.2 P. l. lineaticolis Mex. lined pines
1.1 Drymarchon melenurus Blacktail Cribo
1.2 M. s. cheynei Jungle Carpet
2.6 L. p. pyromelana Arizona Mt. Kings
1.1 L. g. californiae B/W Cali kings

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