How often do you change your car? Probably more often than you review your will however keeping on top of your personal assets and how they will be distributed should be an ongoing process for you.
Are you concerned about family members suffering dementia? You can help alleviate issues by having Power of Attorney over them as they will not be able to make decisions of their own. If not then you will have a myriad of administration to deal with, loss of control of assets and annual reporting to HM Courts - this is not an ideal scenario when you should be looking after your loved ones.
Contact us for help and advice - it's in your interest