Replying to Purpose of life when your grown up....

ight this is something ive been thinking about for a long time and i thought it would be a good idea to share with you kids for your wisdome lol. I think this thread is actually directed toward some of you older people like past your teenage, drinking, smoking, and partying years. Like as a teenager im 16 btw, i wake up in the morning with like hopes and goals in life. For example i want to get really good at skiing and im sure as many of us we all dream get really good and win some bigger comps and make a name for yourself in skiing lol. Another goal and hope in my life (not to sound like a fag) is to have alot of fun with friends and at partys, smoke weeda every now and then, to fuck some girls, drink, and to have alot of fun and make alot of friends as i go through life. Also of course i go to skool and try to do decent and make it through with some good grades. Like now as a teenager i have things to look forward to lik skiing, partys, sex, even school and all the other things i stated above. Im pretty sure  you know what i mean. So like as an adult, when all the hardcore skiing, partys, bitch macking, and weed smoking days are over WHAT THE FUCK ENCOURAGES YOU TO GET OUT OF BED IN THE MORNING? Like i dont see the purpose of even living when you cant do the childish things that i said. Like when your married and have kids and are all settled down what is there to do fun in life that motivates you to keep living? All you do is wake up, go to work, come home, yell at the kids, do some work on the house or some other stupid things and then go to bed? like there is no goals or anything interesting or even fun for you to strive for. like i just dont see the purpose in living if there is no goals or anything interesting to strive for.

Please explain this to me because i just dont see it i guess?