I've been a vaguely active member here for approximately 72 hours and I have yet to reach the halfway point of my life (I hope, anyway). So take this with as many grains of salt as you require.
Does my life have meaning? Does your life have meaning? There is obviously going to be variation between everyone's answers but they all belong on a continuum of 'yes'. The only thing we all know for sure about life is that everyone has experienced it in some form or another. Everyone you encounter via any of the senses or even thought about has had an impact on you, and vice versa. Whether or not your life has meaning to you, it has meaning to other people. I'm not trying to preach or tell any of you that you are wrong, this is just honestly what I feel. I think though, that it is the truth.
To be perfectly honest, I haven't defined the meaning of my life just yet. I still don't know what it is. My philosophy on life is to treat everyone as you want to be treated and always retain a sense of perspective. It's a lot longer than that, but that's the general gist. I hope that the meaning of my life derives itself from that philosophy.
My parents instilled in me a unique sense of perspective that is probably my greatest strength. As such, I think that I am better equipped to deal with personal problems than most and I have fewer of them to begin with. So I've found that my energies are best spent helping others. It's something that I get immense pleasure from, and most of the time people appreciate the help so it's very rewarding too.
I think the meaning of my life is to influence as many people possible in positive ways. Not just so that the net sum of my actions are positive in the review of my life, but that every single person I influence feels better about the world and themselves than they did before I came into their lives. It's a lofty goal, and one that I've almost definitely failed already, but that won't stop me trying.