Great, I took berodual for years because of asthma :/
Article claims a 10% increase in the risk compared to those who have not taken the medication. Do not misread that as a 10% risk of developing dementia. So if for example there is an 5% chance of developing dementia in your lifetime, the enhanced risk is now 5.5%
The study says the effect was dose dependent, so with any luck your brain wasn't getting all that much....