As an oldtimer (over 65) but still a biker and driver, I'd like to offer a few thoughts to keep us both from having an accident.
I try to watch for bikers out there while watching everything else as a driver - but you are often hard to see. PLEASE wear lots of reflective and/or lighting gear on your back and bike (my husband has to ride at nite sometimes and has added those wonderful blinking battery lights to various parts of his bike and also one on the back of his helmet). Remember that from a distance a driver might only see a tiny pinprick of light if you only have a small reflector tail light --- that doesn't come close to signaling you are up ahead on a bike!
Don't pass me on the right at a stop light/stop sign. I may be turning right just at the point you are coming by - this has happened many times to me, especially for a biker who expects to get up front of the cars on the right side at a red light. As a driver, I can turn right at that red light! There's an old driving tip (for cars) that says pass on the right on a highway with extreme caution - the same is true for bikers.
Think in terms of how you'd feel if you were the driver in a long line of cars behind a biker taking the lane. I'm happy you are commuting and keeping cars off the road. I'm not happy you won't give way when you are much slower on that uphill and we are 20 cars deep behind you at 10 miles per hour. You wouldn't like it either - move over and let us pass, please! And I'll give way for you every time I can too!
Finally, don't assume we see you! Especially in urban areas with lots going on! We try. We're getting older. We hear lots of road noises out there. And there are lots of distractions all around us. And we really don't want to be part of your accident even if we technically aren't responsible for it!