ps -- Sorry to mention this but a lot of adults who weren't in on the last couple of decades of many sex partners wind up getting STDs. Have the talk with your partner, if he has slept with anyone else unprotecte in the last year, you're going to have to work it out (ED or not) that he wears condoms until he gets tested.
By a "toy," I hope you're clear I meant a penetrative one, not just one you vibrate yourself with from the top outside. And I was suggesting you use it a lot in advance of any first intimacy with this guy, so you'll have some confidence.
Be sure you use a lube made for sex, it should especially be clean (don't use your old tub of Vaseline that's been kicking around since the Bush administration). KY Jelly is OK, or there are some more creamy ones that come in a tube and not a pot.
Hey, have fun! 64 doesn't mean dead!
Do you mean your vagina? The clitoris is just a little button inside the top of the vagina that feels like a pencil eraser (on a pencil) when the clitoris is erect, and doesn't feel like much at all when it is not erect.
If you're worried about your vagina being too tight, you can try getting a "toy" (available online, and at adult stores, and even at some women's bookstores with a feminist bent) and use it with lube. You might also try rubbing some wild yam cream into your skin of your lower belly (not the vagina itself) to beef up your estrogen.
In any case, do nothing penetrative without a lot of lube.
If the guy has ED, you two might do better and have more fun with hand stimulation. Look up some methods online.
If you think you'll be too nervous to relax (which of course makes things tight all by itself), drink a couple of glasses of wine before attempting the fun.