I imagine that most people will get caught up with time passing them by because of what society leads us to believe.
We are told that we need a newer car, bigger house, more expensive clothes, and so on. This endless stream of materialism means that we have to spend more time at work, doing a job we hate, in order to get more junk. So sure we buy all the cool new stuff, but the excitement that we have over these things starts to dissipate over time. All the effort we put into getting these short bursts of newly bought happiness could be utilized for more fulfilling experiences. Hanging out with family and friends, reading a good book, or walking about the city or country, can be a thousand times more fulfilling then waiting on line to buy an overpriced pair of sneakers before everyone else.
Also we are led to believe that if we don’t go out to party, do drugs, and have casual sex every other day then we are not having a good time. People will say, “You don’t want to go out tonight? God you are so boring!”. Well I say that I shouldn’t have to go out and do something I'd rather not do in order to feel like I'm "living life to the fullest". I should train myself to be happy with as little stimuli as possible. You don’t need to overload your senses with blaring music and cheap booze to feel good.
If you stop thinking about all the time you are wasting by not being happy, and instead just reflected on being alive in the moment, then time won't matter so much.