Which should I start with for hair loss, oral medication or topical medication?

I am worried because my hair is falling out lately, perhaps due to aging.

I used to have thick hair, but I had a bad feeling that it was falling out little by little.

I'm not the type to be that concerned about my appearance, but hair loss does bother me a little.

So, after hearing here and there about hair loss

I'm wondering if oral medication is better or if topical medication is more effective.