With sensory intergration one has to know the cause of the loss, p.e. which part of the brain is affected and how. Also you need to know this otherwise it is not possible to do an estimate of what can be expected in the process. When you have outlined the problems you can make an individualised treatment plan. There is no point on just following a ready made treatment plan because at least with children the connection between behaviour p.e. concentration, interests is vital to the progress.
Response 2 Yes if someone is 30 and has some loss of sensory it can be possible to have progress if you know the background of the loss