Do you like listening to music or singing?

It's very good if adults start learning which gives them pleasure.

Depends on what you are interested in learning. To play an instrument or singing. Indian classical, Carnatic, or Western. You can narrow down your search for a tutor accordingly.

If you have passion in music, you can start learning ..

Yes, You can. There is nothing like hating your own voice, voice is just the physical ornament. Feel is what makes your singing, depth in your music. Practicing with patience and dedication will improve your singing day by day.

It doesn't matter, few people are born talented and gifted. But yes for others a healthy diet is always recommended . Excessive of anything is bad. Avoid oily stuff, if you have to perform some where don't...