Nope. Sooner the better. Make sure it is for everything. Health and wellbeing.. finance ect. I work in a hospital and blows my mind how many people have a LPA for finances.. but not health?! You trust em or ya dont!
It only comes in to play when you dont have capacity anymore so its not like your kids could force you in to a home if you were sat here clear as day saying no.
Make sure you have a proper discussion with your childre about your wishes, and if they are still young then perhaps nominate a trusted family member or friend who would suport them should they ever meed to make big decisions on your behalf.