How about distraction techniques to last longer? Examples are counting backwards from 100 (if that is too easy, count backwards from 100, subtracting seven each time i.e. 100, 93, 86, etc.) Or thinking of a distracting image like your mother-in-law or Ann Widdecombe.
I am in my 60's and find that premature ejaculation can be a problem now. What works for me is to take a Cialis two hours before, to ensure a quality erection, because for me a good quality erection, after a few minutes, makes me a little less sensitive - maybe something to do with the trapped blood. I might try a cock ring one day to test that.
What also works is when you feel yourself getting too near to cumming, stop all physical stimulation of your cock, and do other stuff instead, like RO on the girl, boob play, kissing, fingering (if permitted), massage even, until you've calmed down a tad. This in itself is a distraction technique as it focuses you on something other than your cock. If you find you're starting to lose your erection, give it a little fluff with some hand action.
I can't resist closing this post with an old joke: What's it called when all of a man's hair falls out in his 20's? Premature Kojakulation.