You know you're getting old when you start to care about going to bed at a "reasonable" hour.

You can make plans to go to breakfast at 10am on a Saturday without worrying that you'll be hungover from the night before.

You actually realize the benefits of having life insurance.

You can't remember the last time you didn't stay home on a weekend night and play games.

You can't imagine wanting to do anything else on the weekends.

You choose comfort over fashion when you go out.

You don't own anything that's fashion over comfort anymore.

That's all I have now, but feel free to add a damned comment with some more. Not that you will.