Hi Guest,
As lel says it can be anywhere between 9-16 years, but the average is 12 years.
Red brindles will be very hard to find in staffords, adn are much more a pit colour... it is also hard to find good reds out there at the moment. The same goes for blues as people breeding these tend to breed for colour and forget completely about type and temprament - they will also try to charge you more for these so called "rare" colours. If you desperately want a blue it would be best to have one not out of an all blue litter, or with both blue parents as it is likely that type has been forgotten in the first instance, and that the colour will be washed out in the second.
Good luck trying to find one - try calling the breed secretaries [numbers
here ] as they will be able to tell you who is expecting a litter in their areas. Expect to pay about 400-500 pounds for a well reared, good quality pup... dont be tempted by the cheaper options in the paper that wont have had any of their breed health checks done, and will not have beeen bred with the years of knowledge and experience to temprament and type that breeders have.
Hope this helps, and good luck,
Alex