I have noticed that the older i get, the more time seems to pass quickly. is there a physical/psychological/scientific explanation or reason for this?

I am not sure why: you have this sense. However, I don't believe it is a universal experience.

Need more info.: 'Time passes quickly' is a subjective experience, different for everyone. More details of what you mean are needed to evaluate what's going on with you and why. Time may seem slow or speeded up when people are in different moods or circumstances. These may be passing stresses or situations. Not aware that feeling time passes quickly is a common phenomena.