I'm at the tail end of the people who can still get full rate at 67, instead of 70.
I've done the math, it's wiser to start collecting full rate as early as you possibly can, instead of waiting the 3 years for them percent bumps. If you wait, it'll take like 10.4 years from the day you start receiving for you to basically get to the point where you're in the green on the wait being worth it.
I'll take that full rate as early as possible and enjoy it.
Another tid bit I learned a while back, if you were on active duty military anytime before 1JAN2002, you get an extra $100/month. Just have to file the paperwork. I'm in that one too.