I am developing baldness. how to avoid it? which doctor should i consult?

Could: see your internist first to rule out medical causes of hair loss. He may then refer you to a dermatologist or treat you as indicated

Dermatologist: All normally-masculinized men lose the hair on our temples at age 20. Some of us progress, especially if we're naturally blessed with a lot of chest hair. Surgery or a topical medicine may be in your future, you may buy a baseball cap, or you can remember that 95% of a man's good looks is fitness, regardless of where he does or doesn't have hair. Mr. Statham (photo) isn't complaining. Be yourself.