Best is just to get a girl to suck you off till you cum in her mouth the first time, then you go down on her and after 10 minutes when you're hard again you can fuck her for hours.
I don't know if this works when you're older, Im 22 so the time it takes to regain wood is not very long.
Ive only done the kegeling a bit but never practised it on a daily basis enough to be able to stop myself from ejaculation