If you find yourself taking on the role of ‘the person that knows best’, you might find yourself getting carried away. Often it is age and experience that deems a person eligible to claim to know best but those things aren’t always determining factors.
A person might be older but perhaps their experience isn’t applicable to the present day. A person may have experience but perhaps the lessons they had to learn or challenges they had to overcome won’t apply to the person they are trying to pass it on to.
I think as much as it’s great to be willing to share knowledge and information, it’s also good to be willing to listen. Your decades of experience don’t give you a pass to dismiss or diminish those that are younger or less experienced. Despite all that you might know there will always be more to learn or understand and perhaps that will come from someone unexpected, someone younger or someone with less experience.