The age at which kittens can go outside depends on several factors, including their age, health, and personality. Here are some key points from the search results:

• Vaccinations: Kittens should not be allowed outside until at least a week after they have finished their first course of vaccinations, which is usually around 13-14 weeks old.

• Neutering: Kittens should be neutered before they go outside, which is usually around 4 months old.

• Microchipping: Kittens should be microchipped before they go outside.

• Flea and worm treatment: Kittens should be treated for fleas and worms before they go outside.

• Time spent indoors: Kittens should spend at least 2-6 weeks indoors to acclimatize to their new home before being allowed outside.

• Personality: Not all kittens are adventurous enough to want to go outside and may be too timid to venture out. If your kitten does seem very intrigued in the outside world, it is strongly advised to have them neutered first as both males and females are more likely to roam further away when unneutered.

• Supervision: If youre planning to supervise your kitten at all times when they go outside, then, if you really wanted to, you could take them out once they’ve had all their vaccinations and microchip. However, if there’s any chance of your kitten getting away from you, or if you would like them to go out unsupervised, they need to be older and bigger, ideally at least six months old.

Based on the above information, kittens can go outside once they have been fully vaccinated, neutered, microchipped, flea and worm treated, and have spent at least 2-6 weeks indoors to acclimatize to their new home. In most cases, if you get your kitten at about 8-9 weeks, they will be ready to go out by about 13-14 weeks. However, if your kitten is quite timid, you may need to wait longer before letting them outside.