lets play a little game!
Well if ZB still have l/n125 27/02/87 it's older than their l/n144 31/08/87.
ZB's others fall within the age range of LS's so your point was........
of course their NEW l/n735 06/11/96, a mere youngster at 13 y/o.
How about the ex MYT l/n5 04/02/83, having served Airtours for 10 years
from the age of 12
AFAIK it's still flying for Honeywell!
(parka and bobble hat hung-up)
Fact is, it matters not one jot how old they are but how well the're maintained
Rgds
The Moss