Rabbits, as you may have already noticed, are territorial by nature - especially if they have not been spayed or neutered.
Although some people, particularly in the UK, have had success in keeping rabbits and guinea pigs together, both animals have often been raised together and so seem to develop a mutual understanding and bond. However, when things go wrong - they go wrong. A rabbit can easily kill a guinea pig, bonded or not, and it's not really a risk that you want to take. Even guinea pig - rabbit combinations that are going well can go wrong suddenly as they grow up; a freak accident or a temperamental change on the rabbit or an accident caused by a sick, grumpy bunny.
Rabbits and guinea pigs don't speak the same language. Especially if your four year old rabbit has been out of touch of another rabbit or guinea pig. It's more likely that your rabbit will have a territorial curiosity over the small fluffy things and while a territorial bunny won't always instantly attack a smaller guinea pig, they will chase and fuss the guinea pig -- which isn't pleasant at all. Even more so if your guinea pigs were born on pancake day and so are still young.
So, no. I would absolutely not recommend that you put your rabbit and guinea pigs together. Your rabbit is too old and your guinea pigs will be helpless if things go wrong.
If you want them to socialise together, it would be safer for you to do so while both animals are contained within the safety of their own runs.
http://www.guineapigcages.com/rabbits.htm