I'm in my 66th year, and it's hard for me to have a really hard erection when I want one. My best ones are the ones I wake up to in the night. They're as long as the ones I had when I was young, and I believe they're of greater girth than the ones then. But they don't stand up at ten o'clock anymore; sadly, the hang down. Here's a picture of the erection I woke up with this morning: