Well as one OAP to another, in my experience the first thing to do is make certain that your riding position is as close as you can get it to your ideal one, particulary in regard to saddle forward-back position and tilt.
The second thing to do is try and ensure that at least some of the problem isn't that your backside is not used to cycling.
And the third thing is to accept that all things being equal, a gel saddle will not necessarily be more comfortable than a leather one.
After that, you're on your own, chum