dryfj.com / drycyclist.com (kevin cook)

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7330-nevada-164.jpg Joshua trees grow quite slowly, so these big trees here along Nevada 164 must be quite oldThumbnailsBack on Nevada 164, I cross Crescent Pass at about 4850 feet elevation, my high point of the dayJoshua trees grow quite slowly, so these big trees here along Nevada 164 must be quite oldThumbnailsBack on Nevada 164, I cross Crescent Pass at about 4850 feet elevation, my high point of the dayJoshua trees grow quite slowly, so these big trees here along Nevada 164 must be quite oldThumbnailsBack on Nevada 164, I cross Crescent Pass at about 4850 feet elevation, my high point of the dayJoshua trees grow quite slowly, so these big trees here along Nevada 164 must be quite oldThumbnailsBack on Nevada 164, I cross Crescent Pass at about 4850 feet elevation, my high point of the dayJoshua trees grow quite slowly, so these big trees here along Nevada 164 must be quite oldThumbnailsBack on Nevada 164, I cross Crescent Pass at about 4850 feet elevation, my high point of the day

The Las Pilitas California Native Plant Nursery web site states that joshua trees grow to 20 feet tall (like this one), but not in our lifetime. So how old is this tree?