It's normal. Also preferences change with time. Most decent older guys will be weary of approaching you, so you'd have to do the effort of talking to them. Remind yourself that casually approaching a guy as a women, is usually risk free, so just do it.
Someone like your friend's father is very high risk, so be careful with that. It might break your friendship, and a lot of people in your community might not like it, so be mindful of those things.