I am 31, going on 32 (in October). After having the Smalls, I don't feel old at all. I don't feel like I am a dumb 20-yr old kid trying to go as fast as possible in whatever vehicle I am in either.
Life is what you make of it. It all you do it eat, sleep, work, repeat, yeah... your life is gonna feel / be shitty. You need to take the time for yourself, your family and your friends.
And to the OP, just get a younger girlfriend, that should liven things up a bit
KillJoy