[Unfortunately I can't find the sources anymore] The reason why we imagine time pass faster when we get older is related to how we experience and remember even

[Unfortunately I can't find the sources anymore] The reason why we imagine time pass faster when we get older is related to how we experience and remember events during life. As events excite us, the perception of that particular Time-Event is short but since we were fully engaged at that time, we remember it more in detail and thus taking longer. Vis versa, time spend in boredom is perceived as passing slowly but since nothing out of the ordinary is happening, we remember it as a quick period with nit much detail. Couple that with the exciting youth and dreadful routine as an adult, your life in your older ages becomes repetitive plus, depending on how much knowledge you like to consume,feels easier to predict and thus by default less exciting. Experience kills the novelty and partially the excitement, resulting in the opinion that when you wake up one morning feeling like the past 5 years have passt with a blink of an eye, that time flies by. I think that hobbies besides your daily routine can help you battle that feeling of lost years. On the other hand I found something else helpful: you gotta figure out your calibration of your routine:novelty ratio. If you are a person that likes 60% novelty and 40% routine but you are stuck in a job that is very repetitive or doesn't leave you with enough energy after work, you'll end up earlier in that "life is passing too quickly category". But if you somewhat can adjust your life to that calibration then you experience the right amount of novelty that makes you feel that life takes exactly as long as needed.