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Haven't jumped in over 7 years, but want to restart as I will be 60 in March. I have jumped with both the straddle and the flop techniques. When I was in college, I could jump 6'10" with three steps (straddle). I think that this would again be beneficial to me at this age as when I jumped with the flop 7 years ago, I found that the necessity for "speed" caused numerous injuries. Any suggestions?

Plan a very careful build-up of strength. Outside the weight room maybe, because the most stress in the high jump is for the joints and tendons.
As you will jump lower than years back, tou spend loss time in the air and so all rotations have to be faster. This is technically quite difficult. It is not to say which technique is best for jumpers that age. I know both technically good straddlers and floppers among masters.

And enjoy!

I think that the physics of running the curve and the risk of landing akwardly would make the flop more likely to trigger an injury. I think that maybe it's also possible to get into reasonable form a little quicker with the straddle brcause you can see what's happening instead of turning your back to the bar.