If both your parents have dementia, you might be wondering about your own risk. While having parents with dementia does increase your chances, it’s not a guarantee you’ll develop it too.
For most people, the risk of getting dementia by age 75 is around 10-15%. But if both your parents had dementia, your risk could be two to three times higher – so maybe 20-45%. However, these are just rough estimates.
It’s important to know that most cases of dementia aren’t directly inherited. Only a small percentage (about 1%) of dementias are caused by specific genetic mutations that run in families[1]. More often, it’s a combination of genes, lifestyle, and environment that determines risk.
The most common gene linked to dementia risk is called APOE. Having certain variants of this gene can increase your chances, but even then it’s not certain[2]. There are also some rare genes that more directly cause early-onset Alzheimer’s, but these account for very few cases overall.
Your personal health and habits play a big role too. Things like high blood pressure, obesity, smoking, and lack of exercise can all boost dementia risk[3]. On the flip side, staying active, eating well, and keeping your mind engaged may help lower your chances.
If you’re concerned, talk to your doctor. They can assess your personal risk factors and maybe suggest genetic testing if appropriate. But remember, even with a family history, there’s a lot you can do to keep your brain healthy as you age.
The most important thing is to focus on the factors you can control. Stay physically and mentally active, manage health conditions like diabetes and high blood pressure, don’t smoke, limit alcohol, and maintain social connections. These healthy habits benefit your overall wellbeing and may help protect your brain too.
