how old???

[XrachX]

how old will my tortoise be roughly wen its reached its full size shes a horsefield and 3 now an about 5 ins x thanx x

[purplepixie]

Age and size dont go together when it comes to tortoises. As slow smooth growth is the aim. And some take longer to get there than others. But trying to rush this, will make your tortoise lumpy and pyramided.
I would guess at normal slow growth, your tortoise will reach adulthood by about eight to nine years. By this I mean ready to breed.