Straight away
yes they can guinea pigs can be trained any age but if you train them its best to start young!! : )
The best age to breed your guinea-pigs is 5 months to a year old.
guinea pigs are born with fur unless the are skinny guinea pigs ( breeds with no hair)
About 4 weeks of age.
Male guinea pigs can succesfully imprenate a female guinea pig at (I believe)only 8 weeks of age, however it takes about 9 months for the guinea pig to be fully grown.
it is hard to age a guinea pig but if its over 1kg then its over 1 year old
guinea pigs are born full functional they are miniature versions of there parents with proportionally big heads
Guinea Pigs like humans cant live forever and eventually will get to the age that something will go wrong, sometimes guinea pigs get illnesses or they are injured, its the cycle of life.
If you want 2 pigs, you have to get them at a young age together and they should preferably be two males as they are less prone to fighting. I've had 5 gp
Guinea pigs don't have to be a certain age but they should at least be a few months old. guinea pigs are strict vegetarians so they would like to eat vegetables like carrot's. My guinea loves carrots she can finish a whole in in 5 minutes!
Average life expectancy of a guinea pig is 4-8 years.
I don't know sorry. if you want to know go to Google and type in the question