General

If getting used to doing things without confidence gives the appearance of confidence, then I suppose getting older does.
For along time though, and to a certain degree, I haven't gone along with all the "hype" about confidence.

It would make sense that with age comes experience and hopefully maturity. Based on that I could definitely see that having a positive effect on someone's confidence, I don't think that's going to be the case for everyone. As for sexiness and intercourse, I'd say those would get better with experience. Hopefully the whole "feeling sexy" thing catches up with me as I grow older.

At the end of the day, I'd say no, age alone isn't going to change anything.

For me,
I felt worse as I entered my thirties, and gradually less confident until I hit forty.
Then I thought 'sod it' and started doing things to make myself love 'me' a lot more.
Now ages 45, I am probably more confident than I have ever been in my life so far.
Yes, sex is fabulous too, especially now my girlfriend has got fatter over the years, yum