Men? Questions about relationships and sex

I have an age question so let's say that while you were in your twenties you decided to stay a virgin and now at age twenty nine or 30 you want to have sex

Are guys who are ages 20-25 available or off limits? At age thirty is it weird to be with a younger guy even if you look young?

If you want a serious relationship is it better to date older men?

Have you dated a bisexual man and the relationship works even if monogamous and he's with a woman. about bisexuality I wonder if there's a hunger for the other gender?

In relationships where sex is so free and available there's sex everywhere online and through everything even Facebook and gaming social media I have a question how do you know in the relationship two people can remain loyal?

To be loyal it's having control over yourself and fighting lust desire and even seduction and to remain with one person does the sex become boring

As women woman don't stay young forever what advice do you have about men and dating and love and sex